0000950170-24-057017 | 10-Q | XBRL Viewer

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CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (PARENTHETICAL) - $ / shares	Mar. 31, 2024	Dec. 31, 2023
Preferred stock par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (in shares)	119,221,230	110,160,684
Common stock, shares outstanding (in shares)	119,221,230	110,160,684

Population Health Partners, L.P

3 Months Ended

Mar. 31, 2024

Other Commitments [Abstract]

Population Health Partners, L.P

7. Population Health Partners, L.P.

In November 2022 (the “PHP Effective Date”), the Company entered into a Master Services Agreement with Population Health Partners, L.P. (“PHP”), pursuant to which PHP agreed to provide services and create deliverables for the Company as agreed between the Company and PHP and set forth in one or more work orders under such agreement (the “PHP MSA”). The term of the PHP MSA commenced on the PHP Effective Date for an initial term of one year. The PHP MSA renews for subsequent periods, until terminated in accordance with its terms. On the PHP Effective Date, the Company and PHP entered into the first work order under the PHP MSA (the “PHP Work Order”), pursuant to which PHP agreed to advise and counsel the Company regarding clinical development and regulatory matters with respect to the Company’s product candidates. The PHP Work Order was effective for six months from the PHP Effective Date and terminated in accordance with its terms in May 2023. The PHP MSA contains customary confidentiality provisions and representations and warranties of the parties, as well as mutual non-solicitation of certain employees during the term of the PHP MSA and for a period of one year thereafter.

As compensation for the services and deliverables under the PHP Work Order, the Company paid PHP a cash fee of $0.5 million per month during the term of the PHP Work Order for an aggregate fee of $3.0 million (the “Aggregate Fee”).

During the three months ended March 31, 2024, the Company did not recognize any research and development expense related to the cash compensation paid to PHP. During the three months ended March 31, 2023, the Company recognized $1.5 million of research and development expense related to the cash compensation paid to PHP. Please refer to Note 14 for additional information.

In addition to the cash compensation, on the PHP Effective Date, the Company issued a warrant to purchase shares of the Company’s common stock to PHP (the “PHP Warrant”). The exercise price of the PHP Warrant is $3.48 per share of the Company’s common stock, which was equal to the Nasdaq official closing price (as defined in the PHP Warrant) of a share of the Company’s common stock on the trading day immediately prior to the PHP Effective Date. The PHP Warrant is exercisable for up to an aggregate of 6,824,712 shares of the Company’s common stock, and vests in three separate tranches as follows:


	•		3,591,954 shares of the Company’s common stock underlying the PHP Warrant vests if the Company’s Market Capitalization (as defined below) equals or exceeds $758,517,511 by November 15, 2028;



	•		1,795,977 shares of the Company’s common stock underlying the PHP Warrant vests if the Company’s Market Capitalization equals or exceeds $1,137,776,266 by November 15, 2029; and



	•		1,436,781 shares of the Company’s common stock underlying the PHP Warrant vests if the Company’s Market Capitalization equals or exceeds $1,517,035,022 by November 15, 2030.

For purposes of the PHP Warrant, the term “Market Capitalization” means, with respect to a particular trading day, the total value of the outstanding shares of the Company’s common stock on such date, calculated by multiplying the Company’s volume weighted-average price for the ten (10) trading days immediately preceding such date by the Company’s total number of outstanding shares of the Company’s common stock as reflected in (i) the Company’s most recent periodic or annual report filed with the SEC (e.g., Annual Report on Form 10-K or Quarterly Report on Form 10-Q), as the case may be, (ii) a more recent public announcement by the Company or (iii) a more recent written notice by the Company or the Company’s transfer agent setting forth the number of shares of the Company's common stock outstanding.

The PHP Warrant is exercisable for ten years from the PHP Effective Date with respect to the vested portion(s) of the PHP Warrant. The PHP Warrant may be exercised by cash exercise or, at the election of PHP, by means of “cashless exercise” pursuant to a formula set forth in the PHP Warrant. The Company also granted PHP certain “piggyback” registration rights requiring the Company to register any shares of the Company’s common stock underlying the PHP Warrant for resale with the SEC, subject to the Company’s existing obligations under that certain Second Amended and Restated Investors’ Rights Agreement, dated April 16, 2021, by and among the Company and the investors party thereto, which registration rights PHP exercised in January 2024.

Upon the consummation of a fundamental transaction of the Company (as defined in the PHP Warrant) on or prior to November 15, 2028, all of the shares underlying the PHP Warrant would become immediately vested and exercisable; upon the consummation of a fundamental transaction of the Company after November 15, 2028 but on or prior to November 15, 2029, the shares underlying the second and third tranches of the PHP Warrant would become immediately vested and exercisable; and upon the consummation of a fundamental transaction of the Company after November 15, 2029 but on or prior to November 15, 2030, the shares underlying the third tranche of the PHP Warrant would become immediately vested and exercisable.

Refer to Note 10 for additional information on the PHP Warrant.

Clive Meanwell, M.D. and Tamsin Berry, members of the Company’s board of directors, are Managing Partner and Limited Partner of PHP, respectively.

Defined Contribution Plan	3 Months Ended
Mar. 31, 2024
Retirement Benefits [Abstract]
Defined Contribution Plan	12. Defined Contribution Plan The Company maintains a 401(k) Plan (the “401(k) Plan”) for the benefit of eligible employees. The 401(k) Plan is a defined contribution plan under Section 401(k) of the Internal Revenue Code of 1986, as amended, that covers all employees who meet defined minimum age and service requirements and allows participants to defer a portion of their annual compensation on a pre-tax basis. Pursuant to the terms of the 401(k) Plan, the Company is required to make non-elective contributions of 3% of eligible participants’ compensation. For both the three months ended March 31, 2024 and 2023, the Company contributed $0.2 million to the 401(k) Plan.

Defined Contribution Plan

3 Months Ended

Mar. 31, 2024

Retirement Benefits [Abstract]

Defined Contribution Plan

12. Defined Contribution Plan

The Company maintains a 401(k) Plan (the “401(k) Plan”) for the benefit of eligible employees. The 401(k) Plan is a defined contribution plan under Section 401(k) of the Internal Revenue Code of 1986, as amended, that covers all employees who meet defined minimum age and service requirements and allows participants to defer a portion of their annual compensation on a pre-tax basis. Pursuant to the terms of the 401(k) Plan, the Company is required to make non-elective contributions of 3% of eligible participants’ compensation. For both the three months ended March 31, 2024 and 2023, the Company contributed $0.2 million to the 401(k) Plan.

Net Loss per Share (Tables)

3 Months Ended

Mar. 31, 2024

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

Basic and diluted net loss per share attributable to common stockholders was calculated as follows (in thousands, except share and per share amounts):


	Three Months Ended March 31,			Three Months Ended March 31,
	2024			2023
Numerator:
Net loss attributable to common stockholders	$	(43,496	)	$	(35,321	)
Denominator:
Weighted-average common shares outstanding, basic and diluted		115,618,209			108,785,519
Net loss per share attributable to common stockholders, basic and diluted	$	(0.38	)	$	(0.32	)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share


	For the Three Months Ended March 31,		For the Three Months Ended March 31,
	2024		2023
Stock options to purchase common stock		26,364,033		23,883,782
Unvested restricted common stock		—		93,476
Warrants to purchase common stock		6,824,712		6,824,712
		33,188,745		30,801,970

Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Prepaid Expense and Other Assets, Current [Abstract]
Prepaid external research, development and manufacturing costs	$ 15,582	$ 19,962
Prepaid insurance	1,141	1,770
Prepaid compensation and other	2,788	1,575
Interest receivable	875	933
Prepaid expenses and other current assets	$ 20,386	$ 24,240

Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Assets:
Assets, fair value disclosure	$ 187,690	$ 198,193
Cash Equivalents [Member] \| Money Market Fund [Member]
Assets:
Assets, fair value disclosure	187,690	198,193
Level 1 [Member]
Assets:
Assets, fair value disclosure	187,690	198,193
Level 1 [Member] \| Cash Equivalents [Member] \| Money Market Fund [Member]
Assets:
Assets, fair value disclosure	187,690	198,193
Level 2 [Member]
Assets:
Assets, fair value disclosure	0	0
Level 2 [Member] \| Cash Equivalents [Member] \| Money Market Fund [Member]
Assets:
Assets, fair value disclosure	0	0
Level 3 [Member]
Assets:
Assets, fair value disclosure	0	0
Level 3 [Member] \| Cash Equivalents [Member] \| Money Market Fund [Member]
Assets:
Assets, fair value disclosure	$ 0	$ 0

Commitments and Contingencies - Schedule of Future Minimum Payments Under Non-cancellable Purchase Obligations (Details) $ in Thousands	Mar. 31, 2024 USD ($)
Commitments and Contingencies Disclosure [Abstract]
2024 (excluding the three months ended March 31, 2024)	$ 1,087
2025	430
2026	328
Total lease payments	1,845
Present value adjustment	(86)
Present value of operating lease liability	$ 1,759

Income Taxes

3 Months Ended

Mar. 31, 2024

Income Tax Disclosure [Abstract]

Income Taxes

11. Income Taxes

For the three months ended March 31, 2024 and 2023, the Company recorded no income tax benefits for the net operating losses incurred or for the research and development tax credits generated in each period, due to its uncertainty of realizing a benefit from those items. Substantially all of the Company’s operating losses since inception have been generated in the U.S.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Paragraph 2
-Subparagraph (SAB Topic 11.C)
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482603/740-30-50-2

+ Details

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (UNAUDITED) - USD ($)
$ in Thousands

3 Months Ended

Mar. 31, 2024

Mar. 31, 2023

Operating expenses:

Research and development

^[1]

$ 31,160

$ 27,201

Acquired in-process research and development

^[2]

825

Selling, general and administrative

14,929

11,045

Total operating expenses

46,089

39,071

Loss from operations

(46,089)

(39,071)

Other income:

Other income, net

2,593

3,750

Total other income, net

2,593

3,750

Net loss

(43,496)

(35,321)

Other comprehensive income (loss)

Unrealized gain on available-for-sale securities, net of tax

157

Comprehensive loss

$ (43,495)

$ (35,164)

Net loss per share attributable to common stockholders, basic

$ (0.38)

$ (0.32)

Net loss per share attributable to common stockholders,diluted

$ (0.38)

$ (0.32)

Weighted-average common shares outstanding, basic

115,618,209

108,785,519

Weighted-average common shares outstanding, diluted

115,618,209

108,785,519

[1]	Includes related-party amounts of $1,135 and $2,960 for the three months ended March 31, 2024 and 2023, respectively (see Note 14).
[2]	Includes related-party amounts of $0 and $375 for the three months ended March 31, 2024 and 2023, respectively (see Note 14).

Convertible Preferred Stock - Additional Information (Details) - $ / shares	Mar. 31, 2024	Dec. 31, 2023
Preferred stock, shares issued (in shares)	0	0
Preferred stock par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares issued (in shares)	119,221,230	110,160,684
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000

Commitments and Contingencies

3 Months Ended

Mar. 31, 2024

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

8. Commitments and Contingencies

Operating Lease Commitments

In September 2021, the Company entered into a five-year noncancelable facilities lease agreement for approximately 9,600 square feet of office space in Waltham, Massachusetts. The monthly rental payments under the lease, which include base rent charges of $0.4 million per year, are subject to periodic rent increases through September 2026. In addition to base rent, monthly rental payments include the Company’s proportionate share of operating expenses. The lease terms provide for one five-year extension term with base rent calculated on the then-market rate.

In June 2022, the Company entered into a two-year noncancelable agreement for dedicated laboratory and office space in Newton, Massachusetts (the “Newton, MA Lease”). The monthly rental payments under the agreement include base rent charges of $0.7 million per year. The agreement terms provide for a month-to-month extension after completion of the initial two-year term with base rent calculated on the then-market rate with three months’ prior notice.

In September 2022, the Company amended the Newton, MA Lease. Pursuant to the amendment, the Company entered into a separate two-year noncancelable agreement for new dedicated laboratory and office space on the same campus as the Newton, MA Lease. The Company took occupancy of the new dedicated laboratory and office space in December 2022. The monthly rental payments under the amended agreement include base rent charges of $1.3 million per year. The agreement terms provide for a month-to-month extension, after completion of the initial two-year term extending through November 2024, with base rent calculated on the then-market rate with three months’ prior notice.

The components of operating lease expense were as follows (in thousands):


	For the Three Months Ended March 31,		For the Three Months Ended March 31,
	2024		2023
Lease cost:
Operating lease cost	$	430	$	430
Variable lease cost		3		12
Total lease cost	$	433	$	442

Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows related to operating leases	$	435	$	432

Future minimum lease payments under the noncancelable leases as of March 31, 2024 was as follows (in thousands):


Year Ending December 31,	Operating Lease
2024 (excluding the three months ended March 31, 2024)		1,087
2025		430
2026		328
Total lease payments		1,845
Present value adjustment		(86	)
Present value of operating lease liability	$	1,759

As of March 31, 2024, the Company’s operating leases were measured using a weighted-average incremental borrowing rate of 6.0% over a weighted-average remaining lease term of 1.7 years.

As of March 31, 2023, the Company’s operating leases were measured using a weighted-average incremental borrowing rate of 6.0% over a weighted-average remaining lease term of 2.3 years.

The total operating liabilities are presented on the Company’s condensed consolidated balance sheet based on maturity dates. $1.1 million is classified under “operating lease liabilities, current” for the portion due within twelve months, and $0.6 million is classified under “operating lease liabilities, non-current”.

License Agreements

The Company has entered into license agreements with Adimab and WuXi Biologics (see Note 6).

Other Agreements

In November 2022, the Company entered into the PHP MSA (see Note 7). Concurrently with the PHP MSA, the Company entered into the PHP Work Order, pursuant to which PHP agreed to advise and counsel the Company regarding clinical development and regulatory matters with respect to its product candidates. The PHP Work Order was effective for six months from November 2022 and terminated in accordance with its terms in May 2023. As compensation for the services and deliverables under the PHP Work Order, the Company paid PHP a cash fee of $0.5 million per month during the term of the PHP Work Order for an Aggregate Fee of $3.0 million.

Manufacturing Agreements

In December 2020, the Company entered into a Commercial Manufacturing Services Agreement with WuXi Biologics, which was amended and restated in August 2021 and further amended and restated in September 2023 (as amended and restated, the “Commercial Manufacturing Agreement”). The Commercial Manufacturing Agreement outlines the terms and conditions under which WuXi Biologics manufactures drug substance and drug product for commercial use.

Through March 31, 2024, the Company committed to noncancelable purchase obligations related to commercial drug substance and drug product manufacturing under the Commercial Manufacturing Agreement. As of March 31, 2024, the total remaining contractually binding commercial drug substance and drug product purchase obligations due to WuXi Biologics was $69.3 million,

which is expected to be paid in 2024 and 2025. As of March 31, 2024, $18.4 million related to the contractually binding commercial drug substance and drug product batches was included in accounts payable and accrued expenses, which is expected to be paid in 2024.

Through March 31, 2024, the Company committed to noncancelable purchase obligations of $24.7 million related to the procurement of materials to be used in future drug substance and drug product manufacturing under the Commercial Manufacturing Agreement, which is expected to be paid in 2024.

Unless earlier terminated, the Commercial Manufacturing Agreement remains in effect for an initial period of five years from the date of the last amendment and restatement of the agreement and thereafter automatically renews for further successive periods of five years each. Either party may terminate the agreement upon the breach or default by the other party, other than a non-payment breach, that is not timely cured after notice thereof. Both parties are also entitled to terminate the Commercial Manufacturing Agreement if the other party becomes insolvent or is the subject of a petition in bankruptcy or of any other related proceeding or event. Either party may terminate either the Commercial Manufacturing Agreement in its entirety, or an individual order, (i) to the extent the other party suffers a force majeure event that is continuing for a predefined period of time and (ii) if the other party fails to make a payment when due under the arrangement and such non-payment is not timely cured after notice thereof. Until regulatory approval and future economic benefit is probable, the Company will continue to expense costs related to batches manufactured under the Commercial Manufacturing Agreement.

Other Contracts

The Company enters into agreements with third parties in the ordinary course of business for various products and services, including those related to research, preclinical and clinical operations, manufacturing and support, supply chain, and distribution. These contracts do not contain any material minimum purchase commitments. Certain of these agreements provide for termination rights subject to the payment of termination fees and/or wind-down costs. Under such agreements, the Company is contractually obligated to make certain payments to vendors upon early termination, primarily to reimburse them for their unrecoverable outlays incurred prior to cancellation as well as any amounts owed by the Company prior to early termination. The actual amounts the Company could pay in the future to the vendors under such agreements may differ from the purchase order amounts due to cancellation provisions. The termination fees were not probable of payment as of March 31, 2024 and December 31, 2023.

Legal Proceedings

From time to time, the Company may become involved in legal proceedings or other litigation relating to claims arising in the ordinary course of business. The Company accrues a liability for such matters when it is probable that future expenditures will be made and that such expenditures can be reasonably estimated. Significant judgment is required to determine both probability and estimated exposure amount. Legal fees and other costs associated with such proceedings are expensed as incurred.

On January 31, 2023, a securities class action lawsuit captioned Brill v. Invivyd, Inc., et. al., Case No. 1:23-CV-10254-LTS, was filed against the Company and certain of its former officers in the U.S. District Court for the District of Massachusetts. The complaint alleges violations of Sections 10(b) and 20(a) of the Exchange Act and Rule 10b-5 promulgated thereunder on the basis of purportedly materially false and misleading statements and omissions concerning ADG20’s effectiveness against the Omicron variant of COVID-19. The complaint seeks, among other things, unspecified damages, attorneys’ fees, expert fees, and other costs. The court appointed lead plaintiffs for the action on June 28, 2023. On August 23, 2023, the lead plaintiffs filed an amended complaint that makes allegations similar to those in the original complaint and asserts the same claims against the same defendants as the original complaint. On October 19, 2023, the parties filed a joint stipulation to advise the court that the lead plaintiffs intended to seek leave to file a second amended complaint, and on November 22, 2023, the lead plaintiffs filed a second amended complaint that makes allegations similar to those in the prior complaints and asserts the same claims against the same defendants as the prior complaints. On January 12, 2024, the defendants filed a motion to dismiss the second amended complaint in its entirety. The lead plaintiffs filed an opposition to the motion to dismiss on February 26, 2024, and the defendants filed a reply in further support of their motion to dismiss on March 27, 2024. The court has scheduled a hearing on the defendants’ motion to dismiss on May 10, 2024.

The Company believes that is has strong defenses, and it intends to vigorously defend against this action. The lawsuit is in early stages, and, at this time, no assessment can be made as to the likely outcome or whether the outcome will be material to the Company.

Indemnification Agreements

In the ordinary course of business, the Company may provide indemnification of varying scope and terms to its vendors, lessors, contract research organizations, contract development and manufacturing organizations (“CDMOs”), business partners and other parties with respect to certain matters, including, but not limited to, losses arising out of breach of such agreements or from intellectual property infringement claims made by third parties. In addition, the Company has entered into indemnification agreements with members of its board of directors and its executive officers that require the Company, among other things, to indemnify them against certain liabilities that may arise by reason of their status or service as directors or executive officers. The maximum potential amount of future payments that the Company could be required to make under these indemnification agreements is, in many cases, unlimited. The Company has not incurred any material costs as a result of such indemnifications and is not currently aware of any indemnification claims.

Population Health Partners, L.P (Additional Information) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Other Commitments [Line Items]
Warrant exercise price	$ 3.48
Exercisable common stock	6,824,712
Population Health Partners [Member]
Other Commitments [Line Items]
Cash fee payment per month	$ 0.5
Aggregate fee	3.0
Recognized research and development	$ 0.0	$ 1.5
PHP Warrant [Member] \| November 15, 2028 [Member]
Other Commitments [Line Items]
Common stock, conversion basis	3,591,954 shares of the Company’s common stock underlying the PHP Warrant vests if the Company’s Market Capitalization (as defined below) equals or exceeds $758,517,511 by November 15, 2028;
PHP Warrant [Member] \| November 15, 2029 [Member]
Other Commitments [Line Items]
Common stock, conversion basis	1,795,977 shares of the Company’s common stock underlying the PHP Warrant vests if the Company’s Market Capitalization equals or exceeds $1,137,776,266 by November 15, 2029; and
PHP Warrant [Member] \| November 15, 2030 [Member]
Other Commitments [Line Items]
Common stock, conversion basis	1,436,781 shares of the Company’s common stock underlying the PHP Warrant vests if the Company’s Market Capitalization equals or exceeds $1,517,035,022 by November 15, 2030.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net loss	$ (43,496)	$ (35,321)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	5,379	5,400
Net amortization of premiums and accretion of discounts on marketable securities	0	(2,543)
Amortization of operating lease right-of-use assets	402	379
Depreciation expense	122	120
Changes in operating assets and liabilities:
Inventory	(104)	0
Prepaid expenses and other current assets	4,015	(6,269)
Other non-current assets	(1,682)	(100)
Accounts payable	(6,785)	4,430
Accrued expenses	(6,964)	(6,909)
Operating lease liabilities	(406)	(381)
Other current liabilities	5	13
Other non-current liabilities	(700)	0
Net cash used in operating activities	(50,214)	(41,181)
Cash flows from investing activities:
Maturities of marketable securities	0	75,660
Purchases of property and equipment	(140)	(624)
Net cash provided by (used in) investing activities	(140)	75,036
Cash flows from financing activities:
Proceeds from exercises of stock options	0	459
Proceeds from issuance of common stock under the employee stock purchase plan	89	83
Proceeds from issuance of common stock, net of issuance costs	39,285	0
Payments for offering costs	(273)	0
Net cash provided by financing activities	39,101	542
Net (decrease) increase in cash and cash equivalents	(11,253)	34,397
Cash and cash equivalents at beginning of period	200,641	92,076
Cash and cash equivalents at end of period	189,388	126,473
Supplemental disclosure of cash flow information
Deferred offering and issuance cost included in accrued expenses	$ 133	$ 0

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 0	$ 0

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References + Details

Summary of Significant Accounting Policies (Policies)	3 Months Ended
Summary of Significant Accounting Policies (Policies)	Mar. 31, 2024
Accounting Policies [Abstract]
Inventory	Inventory Prior to receiving regulatory approval or authorization, costs related to the manufacturing of inventory are recorded as research and development expense on the Company’s consolidated statements of operations and comprehensive loss in the period incurred. In connection with the EUA for PEMGARDA in March 2024, the Company subsequently began capitalizing PEMGARDA inventory costs as it was determined that inventory costs incurred subsequent to the EUA had a probable future economic benefit. Inventory is stated at the lower of cost or estimated net realizable value with cost determined on a first-in, first-out basis. Inventory costs include raw materials, third-party contract manufacturing, third-party packaging services, freight and overhead. The Company reduces its inventory to net realizable value for potentially excess, dated or obsolete inventory based on a quarterly assessment of the recoverability of its capitalized inventory. The Company periodically reviews inventory levels to identify what may expire prior to expected sale or has a cost basis in excess of its estimated realizable value and writes-down such inventories as appropriate as a component of costs of goods sold in the consolidated statements of operations and comprehensive loss
Unaudited Interim Financial Information	Unaudited Interim Financial Information The accompanying condensed consolidated balance sheet as of March 31, 2024, the condensed consolidated statements of operations and comprehensive loss for the three months ended March 31, 2024 and 2023, the condensed consolidated statements of cash flows for the three months ended March 31, 2024 and 2023 and the condensed consolidated statements of stockholders’ equity (deficit) for the three months ended March 31, 2024 and 2023 are unaudited. The accompanying unaudited condensed consolidated financial statements as of March 31, 2024 and for the three months ended March 31, 2024 and 2023, have been prepared by the Company pursuant to the rules and regulations of the SEC for interim financial statements. The accompanying condensed consolidated balance sheet as of December 31, 2023 was derived from audited financial statements, but does not include all disclosures required by U.S. GAAP. Certain information and footnote disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. These interim condensed consolidated financial statements should be read in conjunction with the Company’s audited annual consolidated financial statements, and the notes thereto, as of and for the year ended December 31, 2023, which are included in the 2023 Form 10-K. In the opinion of management, all adjustments, consisting only of normal recurring adjustments necessary for a fair statement of the Company’s condensed consolidated financial position as of March 31, 2024 and December 31, 2023, the condensed consolidated results of operations for the three months ended March 31, 2024 and 2023, the condensed consolidated cash flows for the three months ended March 31, 2024 and 2023 and changes in stockholders’ equity (deficit) for the three months ended March 31, 2024 and 2023 have been made. The Company’s condensed consolidated results of operations for the three months ended March 31, 2024 are not necessarily indicative of the results of operations that may be expected for the year ending December 31, 2024.
Use of Estimates	Use of Estimates The preparation of the Company’s condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements, and the reported amounts of expenses during the reporting periods. Significant estimates and assumptions reflected in these condensed consolidated financial statements include, but are not limited to, research and development expenses and related prepaid or accrued costs and stock-based compensation expense. The Company bases its estimates on historical experience, known trends and other market-specific or relevant factors it believes to be reasonable under the circumstances. On an ongoing basis, management evaluates its estimates as there are changes in circumstances, facts and experience. Changes in estimates are recorded in the period in which they become known. Actual results may differ materially from those estimates or assumptions.
Recently Issued and Adopted Accounting Pronouncements	Recently Issued and Adopted Accounting Pronouncements The Company is an “emerging growth company,” as defined in the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”), and may remain an emerging growth company until the last day of the fiscal year following the fifth anniversary of the completion of its IPO. However, if certain events occur prior to the end of such five-year period, including if it becomes a “large accelerated filer,” its annual gross revenues exceeds $1.235 billion or it issues more than $1.0 billion of non-convertible debt in the previous three-year period, it will cease to be an emerging growth company prior to the end of such five-year period. For so long as the Company remains an emerging growth company, it is permitted and intends to rely on exemptions from certain disclosure requirements that are applicable to other public companies that are not emerging growth companies. For example, the JOBS Act provides that an emerging growth company can take advantage of an extended transition period for complying with new or revised accounting standards. This allows an emerging growth company to delay the adoption of these accounting standards until they would otherwise apply to private companies. In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures (“ASU 2023-07”). ASU 2023-07 requires disclosure of incremental segment information on an annual and interim basis. The amendments also require companies with a single reportable segment to provide all disclosures required by this amendment and all existing segment disclosures in ASC 280, Segment Reporting. The amendments are effective for fiscal years beginning after December 15, 2023, and interim periods beginning after December 15, 2024. The Company is currently evaluating the potential impacts of ASU 2023-07 on the consolidated financial statements and related disclosures. In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures (“ASU 2023-09”). ASU 2023-09 modifies the rules on income tax disclosures to enhance the transparency and decision-usefulness of income tax disclosures, particularly in the rate reconciliation table and disclosures about income taxes paid. The amendments are intended to address investors’ requests for income tax disclosures that provide more information to help them better understand an entity’s exposure to potential changes in tax laws and the ensuing risks and opportunities and to assess income tax information that affects cash flow forecasts and capital allocation decisions. The guidance also eliminates certain existing disclosure requirements related to uncertain tax positions and unrecognized deferred tax liabilities. The guidance is effective for all entities for annual periods beginning after December 15, 2025. All entities should apply the guidance prospectively but have the option to apply it retrospectively. Early adoption is permitted. The Company is continuing to assess the timing of adoption and the potential impacts of ASU 2023-09 on the consolidated financial statements and related disclosures.

Summary of Significant Accounting Policies - Additional Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)
Accounting Policies [Abstract]
Annual gross revenue	$ 1,235
Convertible debt	$ 1,000

Net Loss Per Share

3 Months Ended

Mar. 31, 2024

Earnings Per Share [Abstract]

Net Loss Per Share

13. Net Loss per Share

Basic and diluted net loss per share attributable to common stockholders was calculated as follows (in thousands, except share and per share amounts):


	Three Months Ended March 31,			Three Months Ended March 31,
	2024			2023
Numerator:
Net loss attributable to common stockholders	$	(43,496	)	$	(35,321	)
Denominator:
Weighted-average common shares outstanding, basic and diluted		115,618,209			108,785,519
Net loss per share attributable to common stockholders, basic and diluted	$	(0.38	)	$	(0.32	)

Shares of unvested restricted common stock are not considered outstanding for accounting purposes until vested and were excluded from the calculations of basic net loss per share attributable to common stockholders for the three months ended March 31, 2023. There were no shares of unvested restricted common stock for the three months ended March 31, 2024.

The Company’s potential dilutive securities have been excluded from the computation of diluted net loss per share as the effect would be to reduce the net loss per share. Therefore, the weighted-average number of common shares outstanding used to calculate both basic and diluted net loss per share attributable to common stockholders is the same. The Company excluded the following potential common shares, presented based on amounts outstanding at each period end, from the computation of diluted net loss per share attributable to common stockholders for the periods indicated, because including them would have had an anti-dilutive effect:


	For the Three Months Ended March 31,		For the Three Months Ended March 31,
	2024		2023
Stock options to purchase common stock		26,364,033		23,883,782
Unvested restricted common stock		—		93,476
Warrants to purchase common stock		6,824,712		6,824,712
		33,188,745		30,801,970

Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2024

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

2. Summary of Significant Accounting Policies

As of March 31, 2024, the Company’s significant accounting policies and estimates, which are detailed in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023, as filed with the U.S. Securities and Exchange Commission (“SEC”) on March 28, 2024 (the “2023 Form 10-K”) have not changed, except as discussed below.

Inventory

Prior to receiving regulatory approval or authorization, costs related to the manufacturing of inventory are recorded as research and development expense on the Company’s consolidated statements of operations and comprehensive loss in the period incurred. In connection with the EUA for PEMGARDA in March 2024, the Company subsequently began capitalizing PEMGARDA inventory costs as it was determined that inventory costs incurred subsequent to the EUA had a probable future economic benefit.

Inventory is stated at the lower of cost or estimated net realizable value with cost determined on a first-in, first-out basis. Inventory costs include raw materials, third-party contract manufacturing, third-party packaging services, freight and overhead. The Company reduces its inventory to net realizable value for potentially excess, dated or obsolete inventory based on a quarterly assessment of the recoverability of its capitalized inventory. The Company periodically reviews inventory levels to identify what may expire prior to expected sale or has a cost basis in excess of its estimated realizable value and writes-down such inventories as appropriate as a component of costs of goods sold in the consolidated statements of operations and comprehensive loss.

Unaudited Interim Financial Information

The accompanying condensed consolidated balance sheet as of March 31, 2024, the condensed consolidated statements of operations and comprehensive loss for the three months ended March 31, 2024 and 2023, the condensed consolidated statements of cash flows for the three months ended March 31, 2024 and 2023 and the condensed consolidated statements of stockholders’ equity (deficit) for the three months ended March 31, 2024 and 2023 are unaudited.

The accompanying unaudited condensed consolidated financial statements as of March 31, 2024 and for the three months ended March 31, 2024 and 2023, have been prepared by the Company pursuant to the rules and regulations of the SEC for interim financial statements. The accompanying condensed consolidated balance sheet as of December 31, 2023 was derived from audited financial statements, but does not include all disclosures required by U.S. GAAP. Certain information and footnote disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. These interim condensed consolidated financial statements should be read in conjunction with the Company’s audited annual consolidated financial statements, and the notes thereto, as of and for the year ended December 31, 2023, which are included in the 2023 Form 10-K.

In the opinion of management, all adjustments, consisting only of normal recurring adjustments necessary for a fair statement of the Company’s condensed consolidated financial position as of March 31, 2024 and December 31, 2023, the condensed consolidated results of operations for the three months ended March 31, 2024 and 2023, the condensed consolidated cash flows for the three months ended March 31, 2024 and 2023 and changes in stockholders’ equity (deficit) for the three months ended March 31, 2024 and 2023 have been made. The Company’s condensed consolidated results of operations for the three months ended March 31, 2024 are not necessarily indicative of the results of operations that may be expected for the year ending December 31, 2024.

Use of Estimates

The preparation of the Company’s condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements, and the reported amounts of expenses during the reporting periods. Significant estimates and assumptions reflected in these condensed consolidated financial statements include, but are not limited to, research and development expenses and related prepaid or accrued costs and stock-based compensation expense. The Company bases its estimates on historical experience, known trends and other market-specific or relevant factors it believes to be reasonable under the circumstances. On an ongoing basis, management evaluates its estimates as there are changes in circumstances, facts and experience. Changes in estimates are recorded in the period in which they become known. Actual results may differ materially from those estimates or assumptions.

Recently Issued and Adopted Accounting Pronouncements

The Company is an “emerging growth company,” as defined in the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”), and may remain an emerging growth company until the last day of the fiscal year following the fifth anniversary of the completion of its IPO. However, if certain events occur prior to the end of such five-year period, including if it becomes a “large accelerated filer,” its annual gross revenues exceeds $1.235 billion or it issues more than $1.0 billion of non-convertible debt in the previous three-year period, it will cease to be an emerging growth company prior to the end of such five-year period. For so long as the Company remains an emerging growth company, it is permitted and intends to rely on exemptions from certain disclosure requirements that are applicable to other public companies that are not emerging growth companies. For example, the JOBS Act provides that an emerging growth company can take advantage of an extended transition period for complying with new or revised accounting standards. This allows an emerging growth company to delay the adoption of these accounting standards until they would otherwise apply to private companies.

In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures (“ASU 2023-07”). ASU 2023-07 requires disclosure of incremental segment information on an annual and interim basis. The amendments also require companies with a single reportable segment to provide all disclosures required by this amendment and all existing segment disclosures in ASC 280, Segment Reporting. The amendments are effective for fiscal years beginning after December 15, 2023, and interim periods beginning after December 15, 2024. The Company is currently evaluating the potential impacts of ASU 2023-07 on the consolidated financial statements and related disclosures.

In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures (“ASU 2023-09”). ASU 2023-09 modifies the rules on income tax disclosures to enhance the transparency and decision-usefulness of income tax disclosures, particularly in the rate reconciliation table and disclosures about income taxes paid. The amendments are intended to address investors’ requests for income tax disclosures that provide more information to help them better understand an entity’s exposure to potential changes in tax laws and the ensuing risks and opportunities and to assess income tax information that affects cash flow forecasts and capital allocation decisions. The guidance also eliminates certain existing disclosure requirements related to uncertain tax positions and unrecognized deferred tax liabilities. The guidance is effective for all entities for annual periods beginning after December 15, 2025. All entities should apply the guidance prospectively but have the option to apply it retrospectively. Early adoption is permitted. The Company is continuing to assess the timing of adoption and the potential impacts of ASU 2023-09 on the consolidated financial statements and related disclosures.

Common Stock

3 Months Ended

Mar. 31, 2024

Equity [Abstract]

Common Stock

9. Common Stock

Shares Reserved for Future Issuance

As of March 31, 2024, the Company had reserved 46,292,290 shares of common stock for the exercise of outstanding stock options and the issuance of awards available for grant under the Company’s 2020 Equity Incentive Plan, 2021 Equity Incentive Plan and 2021 Employee Stock Purchase Plan (see Note 10).

Shelf Registration Statement

In September 2022, the Company filed a shelf registration statement on Form S-3 with the SEC (File No. 333-267643) and an accompanying base prospectus, which was declared effective by the SEC on October 5, 2022, for the offer and sale of up to $400 million of the Company’s securities. As of March 31, 2024, $325 million of the Company’s securities remained available for offer and sale under this shelf registration statement.

ATM Facility

In December 2023, the Company entered into a Controlled Equity OfferingSM Sales Agreement (the “Sales Agreement”) with Cantor Fitzgerald & Co., as sales agent (“Cantor”), pursuant to which the Company may, at its option, offer and sell shares of its common stock, with a sales value of up to $75.0 million, from time to time, through Cantor, acting as sales agent, in transactions deemed to be “at the market offerings”, as defined in Rule 415 under the Securities Act of 1933, as amended. Cantor is entitled to a commission of 3% of the gross proceeds from any sales of such shares.

In February 2024, the Company sold 9,000,000 shares of its common stock under the Sales Agreement at an average price of $4.50 per share for $39.3 million in net proceeds. As of March 31, 2024, $34.5 million remained available for sale under the Sales Agreement.

Treasury Stock

In March 2023, the Company repurchased, and subsequently retired, 206,802 shares of unvested restricted common stock at the original purchase price upon a termination of service of an employee during the vesting period. The fair value of the repurchased common stock was insignificant. Upon retirement, the shares were redesignated as authorized but unissued shares of the Company’s common stock.

In May 2023, the Company repurchased 46,600 shares of unvested restricted common stock at the original purchase price upon a termination of service of an employee during the vesting period. The shares of common stock repurchased were recorded as treasury stock. The fair value of the repurchased common stock was insignificant. In June 2023, the Company retired the 46,600 shares of treasury stock. Upon retirement, the shares were redesignated as authorized but unissued shares of the Company’s common stock.

In October 2023, the Company repurchased 31,765 shares of unvested restricted common stock at the original purchase price upon a termination of service of an employee during the vesting period. The shares of common stock repurchased were recorded as treasury stock. The fair value of the repurchased common stock was insignificant. In December 2023, the Company retired the 31,765 shares of treasury stock. Upon retirement, the shares were redesignated as authorized but unissued shares of the Company’s common stock.

- Definition

The entire disclosure for equity.

+ References

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+ Details

Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2024

Fair Value Disclosures [Abstract]

Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis

The following tables present the Company’s fair value hierarchy for its assets and liabilities that are measured at fair value on a recurring basis (in thousands):


	Fair Value Measurements at March 31, 2024:
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	187,690	$	—	$	—	$	187,690
	$	187,690	$	—	$	—	$	187,690


	Fair Value Measurements at December 31, 2023:
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	198,193	$	—	$	—	$	198,193
	$	198,193	$	—	$	—	$	198,193

Accrued Expenses

3 Months Ended

Mar. 31, 2024

Accrued Liabilities [Abstract]

Accrued Expenses

5. Accrued Expenses

Accrued expenses consisted of the following (in thousands):


	March 31, 2024		December 31, 2023
Accrued external research, development and manufacturing costs	$	29,139	$	28,151
Accrued professional and consultant fees		3,008		1,732
Accrued employee compensation		1,689		10,752
Other		167		225
	$	34,003	$	40,860

Stock-Based Compensation - Schedule of Weighted Average Fair Values and Valuation Assumptions (Details) - Share-Based Payment Arrangement, Option [Member]	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	5 years 9 months 18 days	5 years 9 months 18 days
Expected volatility	62.80%	69.30%
Risk-free interest rate	4.00%	3.50%
Expected dividend yield	0.00%	0.00%

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

Commitments and Contingencies - Additional Information (Details) $ in Thousands				3 Months Ended
	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Sep. 14, 2021 USD ($) ft²	Mar. 31, 2024 USD ($)	Mar. 31, 2023	Dec. 31, 2023 USD ($)	Nov. 30, 2022 USD ($)
Long-Term Purchase Commitment [Line Items]
Lease term			5 years
Lease space \| ft²			9,600
Monthly rental payments	$ 1,300	$ 700	$ 400
Operating lease liability, non-current				$ 625		$ 722
Borrowing rate				6.00%	6.00%
Weighted-average remaining lease term				1 year 8 months 12 days	2 years 3 months 18 days
Operating lease liability, current				$ 1,134		1,443
Fees to be paid in cash							$ 3,000
Purchase Obligation				1,845
Total cost incurred
PHP
Long-Term Purchase Commitment [Line Items]
Fees to be paid in cash							$ 500
VYD222 Drug Substance
Long-Term Purchase Commitment [Line Items]
Purchase Obligation				24,700
Wu Xi Commercial Manufacturing Services Agreement [Member]
Long-Term Purchase Commitment [Line Items]
Purchase Obligation				69,300
Wu Xi Commercial Manufacturing Services Agreement [Member] \| VYD222 Drug Substance
Long-Term Purchase Commitment [Line Items]
Purchase Obligation				$ 18,400

Stock-Based Compensation - Summary of Share Based Compensation Expense Recognized (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock based compensation expense	$ 5,379	$ 5,400
Research and Development [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock based compensation expense	1,677	2,263
Selling, General and Administrative [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock based compensation expense	$ 3,702	$ 3,137

Nature of Business and Basis of Presentation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended
	Feb. 29, 2024	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Net Income (Loss)		$ (43,496)	$ (35,321)
Accumulated deficit		(775,565)		$ (732,069)
Proceeds from issuance of common stock under the employee stock purchase plan		$ 89	$ 83
Sales Agreement [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Issuance of common stock, shares	9,000,000
Proceeds from issuance of common stock under the employee stock purchase plan	$ 39,300
Sale of stock, price per share	$ 4.5

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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+ Details

- Definition

Amount of accumulated undistributed earnings (deficit).

+ References + Details

Prepaid Expenses and Other Current Assets (Tables)

3 Months Ended

Mar. 31, 2024

Prepaid Expense and Other Assets, Current [Abstract]

Summary of Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consisted of the following (in thousands):


	March 31, 2024		December 31, 2023
Prepaid external research, development and manufacturing costs	$	15,582	$	19,962
Prepaid insurance		1,141		1,770
Prepaid compensation and other		2,788		1,575
Interest receivable		875		933
	$	20,386	$	24,240

Related Party Transactions

3 Months Ended

Mar. 31, 2024

Related Party Transactions

14. Related Party Transactions

As of both March 31, 2024 and December 31, 2023, an aggregate of $0.7 million was due to Adimab under the Adimab Assignment Agreement, the Adimab Collaboration Agreement, the Adimab Platform Transfer Agreement and the Adimab DNA Sequencing Services Agreement (as defined below) by the Company. As of March 31, 2024 and December 31, 2023, no amounts were due to the Company from Adimab under the Adimab Assignment Agreement, the Adimab Collaboration Agreement, the Adimab Platform Transfer Agreement or the Adimab DNA Sequencing Services Agreement.

Adimab Assignment Agreement

Under the Adimab Assignment Agreement, Adimab, a principal stockholder of the Company, is entitled to receive milestone and royalty payments upon specified conditions and receives payments from the Company for providing ongoing services under the agreement (see Note 6).

During the three months ended March 31, 2024, the Company did not recognize any IPR&D expense with respect to milestones payable under the Adimab Assignment Agreement. During the three months ended March 31, 2023, the Company recognized $0.4 million as IPR&D expense with respect to a milestone payable under the Adimab Assignment Agreement.

During both the three months ended March 31, 2024 and 2023, the Company did not recognize any research and development expense with respect to services performed by Adimab on the Company’s behalf under the Adimab Assignment Agreement.

Adimab Collaboration Agreement

Under the Adimab Collaboration Agreement, the Company is obligated to pay Adimab for certain fees, milestones and royalty payments (see Note 6).

During the three months ended March 31, 2024 and 2023, the Company recognized $0.6 million and $1.3 million, respectively, of research and development expense related to the quarterly fee under the Adimab Collaboration Agreement.

During the three months ended March 31, 2024, the Company did not recognize any research and development expense with respect to services performed by Adimab on the Company’s behalf under the Adimab Collaboration Agreement. During the three months ended March 31, 2023, the Company recognized $0.2 million of research and development expense with respect to services performed by Adimab on the Company’s behalf under the Adimab Collaboration Agreement.

Adimab Platform Transfer Agreement

Under the Adimab Platform Transfer Agreement, the Company is obligated to pay Adimab for certain fees, milestones and royalty payments (see Note 6).

During the three months ended March 31, 2024, the Company recognized a portion of the first annual fee as research and development expense. During the three months ended March 31, 2023, the Company did not recognize any research and development expense in connection with the Adimab Platform Transfer Agreement.

Adimab DNA Sequencing Services Agreement

In May 2023, as amended in January 2024, the Company entered into a Services Agreement with Adimab for Adimab to perform DNA sequencing on yeast samples provided by the Company, and the delivery of the resulting data and information to the Company (the “Adimab DNA Sequencing Services Agreement”). In exchange for the services performed, the Company will pay Adimab a fee for each yeast-derived DNA template sample present in the well within the sequencer plate.

During the three months ended March 31, 2024, the Company recognized less than $0.1 million of research and development expense with respect to services performed by Adimab on the Company’s behalf under the Adimab DNA Sequencing Services Agreement. The Adimab DNA Sequencing Services Agreement was not effective during the three months ended March 31, 2023.

Population Health Partners, L.P.

Under the PHP MSA and PHP Work Order, the Company was obligated to pay cash compensation for services and deliverables (see Note 7). Clive Meanwell, M.D. and Tamsin Berry, members of the Company’s board of directors, are Managing Partner and Limited Partner of PHP, respectively.

During the three months ended March 31, 2023, the Company recognized $1.5 million of research and development expense related to services performed by PHP in connection with the PHP Work Order, which terminated in accordance with its terms in May 2023.

As of March 31, 2024, no amounts were due to PHP by the Company, and no amounts were due from PHP to the Company.

- Definition

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

+ References

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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483326/850-10-50-1

+ Details

License and Collaboration Agreements

3 Months Ended

Mar. 31, 2024

License Agreements [Abstract]

License and Collaboration Agreements

6. License and Collaboration Agreements

Adimab Assignment Agreement

In July 2020, the Company entered into an Assignment and License Agreement with Adimab (the “Adimab Assignment Agreement”). Under the terms of the agreement, Adimab assigned to the Company all rights, title and interest in and to certain of its coronavirus-specific antibodies (each, a “CoV Antibody” and together, the “CoV Antibodies”), including modified or derivative forms thereof, and related intellectual property. In addition, Adimab granted to the Company a non-exclusive, worldwide, royalty-bearing, sublicensable license to certain of its platform patents and technology for the development, manufacture and commercialization of the CoV Antibodies and pharmaceutical products containing or comprising one or more CoV Antibodies (each, a “Product”) for all indications and uses, with the exception of certain diagnostic uses and use as a research reagent (the “Field”). The Company is entitled to sublicense the assigned rights and licensed intellectual property solely with respect to any CoV Antibody or Product, subject to specified conditions of the agreement. The Company is obligated to use commercially reasonable efforts to achieve specified development and regulatory milestones for Products in certain major markets and to commercialize a product in any country in which the Company obtains marketing approval.

Pursuant to the terms of the Adimab Assignment Agreement, the parties will establish one or more work plans that set forth the activities to be performed under the agreement (each, a “Work Plan”), and each party is responsible for performing the obligations to which it is assigned under such Work Plans. Upon execution of the Adimab Assignment Agreement, the Company and Adimab agreed on an initial Work Plan that outlined the services that will be performed commencing at inception of the arrangement. The Company is obligated to pay Adimab quarterly for its services performed under each Work Plan at a specified full-time equivalent rate. Otherwise, the Company is solely responsible for the development, manufacture and commercialization of the CoV Antibodies and associated Products at its own cost and expense. The Company is solely responsible for preparing and submitting all investigational new drug applications, new drug applications, biologics license applications and other regulatory filings for the CoV Antibodies and Products in the Field, and for obtaining and maintaining all marketing approvals for Products in the Field, at its sole expense. Additionally, the Company has the sole right to prosecute, maintain, enforce and defend patents covering the CoV Antibodies and Products, all at its own expense.

Amounts paid with respect to services performed by Adimab on the Company’s behalf under the Adimab Assignment Agreement are recognized as research and development expense as such amounts are incurred. During both the three months ended March 31, 2024 and 2023, the Company did not recognize any research and development expense with respect to services performed by Adimab on the Company’s behalf under the Adimab Assignment Agreement. Please refer to Note 14 for additional information.

The Company is obligated to pay Adimab up to $16.5 million upon the achievement of specified development and regulatory milestones for the first Product under the agreement that achieves such specified milestones and up to $8.1 million upon the achievement of specified development and regulatory milestones for the second Product under the agreement that achieves such specified milestones. The maximum aggregate amount of milestone payments payable under the agreement for any and all Products is $24.6 million, of which a total of $11.1 million has been achieved and paid as of March 31, 2024; however, milestone payments do not accrue for certain in vitro diagnostic devices consisting of or containing CoV Antibodies.

In March 2023, the Company achieved the first specified milestone for the second product candidate under the Adimab Assignment Agreement upon dosing of the first subject in a Phase 1 clinical trial evaluating VYD222, which obligated the Company to make a $0.4 million milestone payment to Adimab, which was paid in May 2023. In September 2023, the Company achieved specified milestones for the second product candidate under the Adimab Assignment Agreement upon dosing of the first subject in a pivotal clinical trial evaluating VYD222, which obligated the Company to make a $3.2 million milestone payment to Adimab, which was paid in October 2023. The next potential milestone under the Adimab Assignment Agreement is a low single-digit million-dollar regulatory milestone, which was not considered probable under U.S. GAAP and therefore, no expense was recognized as of March 31, 2024.

During the three months ended March 31, 2024, the Company did not recognize any in-process research and development (“IPR&D”) expense with respect to contingent consideration payable under the Adimab Assignment Agreement. During the three months ended March 31, 2023, the Company recognized $0.4 million of IPR&D expense with respect to contingent consideration payable under the Adimab Assignment Agreement.

The Company is obligated to pay Adimab royalties of a mid-single-digit percentage based on net sales of any Products, beginning upon the first commercial sale of a Product in accordance with the Adimab Assignment Agreement. The royalty rate is subject to reductions specified under the agreement. Royalties are due on a Product-by-Product and country-by-country basis beginning upon the first commercial sale of each Product and ending on the later of (i) 12 years after the first commercial sale of such Product in such country and (ii) the expiration of the last valid claim of a patent covering such Product in such country (the “Royalty Term”). In addition, the Company is obligated to pay Adimab royalties of a specified percentage in the range of 45% to 55% of any compulsory sublicense consideration received by the Company in lieu of certain royalty payments. Except for milestone payments of $11.1 million incurred through December 31, 2023, no other milestone, royalty or other contingent payments had become due to Adimab through March 31, 2024.

Unless earlier terminated, the Adimab Assignment Agreement remains in effect until the expiration of the last-to-expire Royalty Term for any and all Products. The Company may terminate the agreement at any time for any or no reason upon advance written notice to Adimab, or in the event of a material breach by Adimab that is not cured with specific periods. Adimab may only terminate the agreement for an uncured material breach by the Company for its due diligence obligation or a payment obligation. Upon any termination of the agreement prior to its expiration, all licenses and rights granted pursuant to the arrangement will automatically terminate and revert to the granting party and all other rights and obligations of the parties will terminate.

The Company concluded that the Adimab Assignment Agreement represented an asset acquisition of IPR&D assets with no alternative future use. The arrangement did not qualify as a business combination because substantially all of the fair value of the assets acquired was concentrated in a single asset.

Adimab Collaboration Agreement

In May 2021, the Company entered into a Collaboration Agreement with Adimab, as amended in November 2022 and September 2023 (the “Adimab Collaboration Agreement”), for the discovery and optimization of proprietary antibodies as potential therapeutic product candidates. Under the Adimab Collaboration Agreement, the Company and Adimab could collaborate on research programs for a specified number of targets selected by the Company within a specified time period. Under the Adimab Collaboration Agreement, Adimab granted the Company a worldwide, non-exclusive license to certain of its platform patents and technology and antibody patents to perform the Company’s responsibilities during the ongoing research period and for a specified evaluation period thereafter (the “Evaluation Term”). In addition, the Company granted Adimab a license to certain of the Company’s patents and intellectual property solely to perform Adimab’s responsibilities under the research plans. Under the Adimab Collaboration Agreement, the Company has an exclusive option, on a program-by-program basis, to obtain licenses and assignments to commercialize selected products containing or comprising antibodies directed against the applicable target, which option may be exercised upon the payment of a specified option fee for each program. Upon exercise of an option by the Company, Adimab will assign to the Company all right, title and interest in the antibodies of the optioned research program and will grant the Company a worldwide, royalty-free, fully paid-up, non-exclusive, sublicensable license under the Adimab platform technology for the development, manufacture and commercialization of the antibodies for which the Company has exercised its options and products containing or comprising those antibodies. The Company is obligated to use commercially reasonable efforts to develop, seek marketing approval for, and commercialize one product that contains an antibody discovered in each optioned research program.

The Company agreed to pay Adimab a quarterly fee of $1.3 million, which could be cancelled at the Company’s option at any time. For so long as the Company was paying such quarterly fee (or earlier if (i) the Company experienced a change of control after the third anniversary of the Adimab Collaboration Agreement or (ii) Adimab owned less than a specified percentage of the Company’s equity), Adimab and its affiliates agreed not to assist or direct certain third parties to discover or optimize antibodies intended to bind to coronaviruses or influenza viruses. Under the Adimab Collaboration Agreement, the Company could also elect to decrease the scope of Adimab’s exclusivity obligations and obtain a corresponding decrease in the quarterly fee. In December 2023, the Company elected to decrease the scope of Adimab’s exclusivity obligations to cover only coronaviruses, and obtained a corresponding decrease in the quarterly fee. Effective January 2024, the Company became obligated to pay Adimab a quarterly fee of $0.6 million. During the three months ended March 31, 2024 and 2023, the Company recognized $0.6 million and $1.3 million, respectively, of research and development expense related to the quarterly fee.

For each agreed upon research program that is commenced, the Company is obligated to pay Adimab quarterly for its services performed during a given research program at a specified full-time equivalent rate; a discovery delivery fee of $0.2 million; and an optimization completion fee of $0.2 million. For each option exercised by the Company to commercialize a specific research program, the Company is obligated to pay Adimab an exercise fee of $1.0 million. Amounts paid with respect to services performed by Adimab on the Company’s behalf in each of the research programs under the Adimab Collaboration Agreement are recognized as research and development expense as such amounts are incurred and services are rendered. During the three months ended March 31, 2024, the Company did not recognize any research and development expense with respect to services performed by Adimab on the Company’s behalf under the Adimab Collaboration Agreement. During the three months ended March 31, 2023, the Company recognized $0.2 million of research and development expense with respect to services performed by Adimab on the Company’s behalf under the Adimab Collaboration Agreement. During both the three months ended March 31, 2024 and 2023, the Company did not recognize any

IPR&D expense related to drug delivery fees, optimization completion fees or option exercise fees. Please refer to Note 14 for additional information.

The Company is obligated to pay Adimab up to $18.0 million upon the achievement of specified development and regulatory milestones for each product under the Adimab Collaboration Agreement that achieves such milestones. The next potential milestone under the Adimab Collaboration Agreement is a low single-digit million-dollar clinical milestone, which was not considered probable under U.S. GAAP and therefore, no expense was recognized as of March 31, 2024. The Company is also obligated to pay Adimab royalties of a mid-single-digit percentage based on net sales of any product under the Adimab Collaboration Agreement, subject to reductions for third-party licenses. The royalty term will expire for each product on a country-by-country basis upon the later of (i) 12 years after the first commercial sale of such product in such country and (ii) the expiration of the last valid claim of any patent claiming composition of matter or method of making or using any antibody identified or optimized under the Adimab Collaboration Agreement in such country.

In addition, the Company is obligated to pay Adimab for Adimab’s performance of certain validation work with respect to certain antigens acquired from a third party. In consideration for this work, the Company is obligated to pay Adimab royalties of a low single-digit percentage based on net sales of products that contain such antigens for the same royalty term as antibody-based products, but the Company is not obligated to make any milestone payments for such antigen products. Through March 31, 2024, the Company had not paid any royalties to Adimab under the Adimab Collaboration Agreement.

The Adimab Collaboration Agreement will expire (i) if the Company does not exercise any option, upon the conclusion of the last Evaluation Term for the research programs, or (ii) if the Company exercises an option, on the expiration of the last royalty term for a product in a particular country, unless the agreement is earlier terminated. The Company may terminate the Adimab Collaboration Agreement at any time upon advance written notice to Adimab. In addition, subject to certain conditions, either party may terminate the Adimab Collaboration Agreement in the event of a material breach by the other party that is not cured within specified periods.

The Company concluded that the Adimab Collaboration Agreement represented an asset acquisition of IPR&D with no alternative future use. Therefore, payments made by the Company to Adimab for milestones achieved will be recognized as IPR&D expense in the related period in which the services are performed or the related milestone is considered probable of achievement. Amounts paid with respect to services performed by Adimab on the Company’s behalf under the Adimab Collaboration Agreement are recognized as research and development expense as such amounts are incurred and services are rendered. Please refer to Note 14 for additional information.

Adimab Platform Transfer Agreement

In September 2022 (the “Adimab Platform Transfer Agreement Effective Date”), the Company entered into a Platform Transfer Agreement with Adimab (the “Adimab Platform Transfer Agreement”) under which the Company was granted the right under certain intellectual property of Adimab to practice certain elements of Adimab’s platform technology, including B-cell cloning using Adimab’s proprietary yeast cell lines and other antibody optimization libraries, trade secrets, protocols and software of Adimab, to discover, engineer and optimize antibodies. The Company does not have access to Adimab’s proprietary discovery libraries. The Company was also granted the right under certain intellectual property of Adimab to research, develop, make, sell and exploit such antibodies and products containing such antibodies. The Adimab platform has been transferred to the Company in accordance with the terms of the Adimab Platform Transfer Agreement. In September 2022, the Company recognized $3.0 million as IPR&D expense in connection with the upfront consideration payable for the rights assigned pursuant to the Adimab Platform Transfer Agreement.

The Company is obligated to pay Adimab an annual fee of single digit millions on each of the first four anniversaries of the Adimab Platform Transfer Agreement Effective Date, which allows the Company to receive material improvements to the platform technology, including materially improved antibody optimization libraries, updates that provide new functionality to the platform, and software upgrades, from Adimab through June 2027. The first annual fee became due in September 2023 and was paid in October 2023. During the three months ended March 31, 2024, the Company recognized a portion of the first annual fee as research and development expense. Beginning in July 2027 and ending in June 2042, unless terminated earlier, the Company has the option to receive additional material improvements to the platform technology from Adimab, subject to a commercially reasonable fee to be negotiated by the parties.

The Company is obligated to pay Adimab up to $9.5 million upon the achievement of specified development and regulatory milestones for each product under the Adimab Platform Transfer Agreement that achieves such milestones. The next potential milestone under the Adimab Platform Transfer Agreement is a mid-six-digit dollar preclinical milestone, which was not considered probable under U.S. GAAP and therefore, no expense was recognized as of March 31, 2024.

In addition, the Company is obligated to pay Adimab royalties of a low single-digit percentage based on net sales of products containing an antibody discovered, engineered or optimized using Adimab’s platform technology, subject to reductions specified under the Adimab Platform Transfer Agreement. Royalties are due on a product-by-product and country-by-country basis. The royalty term will expire for each product on a country-by-country basis upon the later of (i) 12 years after the first commercial sale of such product in such country and (ii) the expiration of the last valid claim of a program antibody patent for covering the program antibody contained

in such product in such country. Through March 31, 2024, the Company had not paid any royalties to Adimab under the Adimab Platform Transfer Agreement.

The Company may terminate the Adimab Platform Transfer Agreement at any time upon advance written notice to Adimab. In addition, subject to certain conditions, either party may terminate the Adimab Platform Transfer Agreement in the event of a material breach by the other party that is not cured within specified periods or in connection with the other party’s insolvency.

The Company concluded that the Adimab Platform Transfer Agreement represented an asset acquisition of IPR&D with no alternative future use. Therefore, payments made by the Company to Adimab for milestones achieved will be recognized as IPR&D expense in the related period in which the services are performed or the related milestone is considered probable of achievement. Amounts paid with respect to the annual material improvement fees are recognized as research and development expense as such amounts are incurred. Please refer to Note 14 for additional information.

WuXi Biologics Cell Line License Agreement

In December 2020, as amended in February 2023 and March 2024, the Company entered into a Cell Line License Agreement with WuXi Biologics (Hong Kong) Limited (“WuXi Biologics”) (the “Cell Line License Agreement”), under which WuXi Biologics granted to the Company a non-exclusive, non-transferable, worldwide, royalty-bearing, sublicensable license to certain of its intellectual property, including certain patent rights associated with a proprietary cell line developed by WuXi Biologics for the exploitation of certain recombinant antibodies developed using such proprietary cell line (each, a “Licensed Product”). Each Licensed Product generated under the arrangement will be produced from a transformed or transfected version of the proprietary cell line derived by WuXi Biologics (each of such transformed or transfected cell lines, a “Licensed Cell Line”).

In December 2020, the Company recognized an upfront fee of $0.2 million upon completion of cell bank generation for the first Licensed Cell Line created under the Cell Line License Agreement.

The Company is also obligated to pay royalties in the range of less than 1.0% to WuXi Biologics based on net sales of any Licensed Products manufactured by the Company or a third party on its behalf. However, if the Company uses WuXi Biologics to manufacture all of its commercial supplies for Licensed Products, no royalties would be owed by the Company to WuXi Biologics for net sales of Licensed Products. The Company has an option to buy out its royalty obligations on a Licensed Cell Line-by-Licensed Cell Line basis by making a one-time payment in the low eight-figures to WuXi Biologics. Royalties are due on a Licensed Product-by-Licensed Product basis commencing on the date of the first commercial sale of the applicable product and continuing for so long as the Company commercializes Licensed Products or, if earlier, until the Company exercises its option to buy out the royalty obligations. Through March 31, 2024, no royalties had become due to WuXi Biologics.

The Cell Line License Agreement remains in effect until it is terminated. The Company may terminate the Cell Line License Agreement at any time with notice to WuXi Biologics. WuXi Biologics may terminate the Cell Line License Agreement in the event the Company fails to make a payment when due under the Cell Line License Agreement and such non-payment is not cured within a specified period after notice. Either party may terminate the Cell Line License Agreement in the event of a material breach by the other party that is not cured within a specified period after notice. Upon termination of the Cell Line License Agreement, the license conveyed by WuXi Biologics to the Company will continue in full force and effect with respect to all Licensed Products manufactured using the Licensed Cell Line already generated under the Cell Line License Agreement, provided that the Company continues to pay its royalty obligations, if any.

The Company concluded that the Cell Line License Agreement represented an asset acquisition of IPR&D with no alternative future use. The Cell Line License Agreement did not qualify as a business combination because substantially all of the fair value of the assets acquired was concentrated in a single asset. The Company did not recognize any IPR&D expense under the Cell Line License Agreement during the three months ended March 31, 2024. The Company recognized $0.4 million of IPR&D expense under the Cell Line License Agreement during the three months ended March 31, 2023.

Common Stock - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended			3 Months Ended
	May 31, 2023	Sep. 30, 2022	Feb. 29, 2024	Oct. 31, 2023	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Jun. 30, 2023
Security for sale offering		$ 400,000
Common stock, par value						$ 0.0001		$ 0.0001
Proceeds from issuance of common stock under the employee stock purchase plan						$ 89	$ 83
Common stock, shares issued (in shares)						119,221,230		110,160,684
Convertible Preferred Stock, Shares Reserved for Future Issuance						46,292,290
ATM Facility [Member]
Security for sale offering						$ 75,000
Commission On Sales						3.00%
Shelf Registration Statement [Member]
Securities, available for offer and sale						$ 325,000
Treasury Stock [Member]
Common shares repurchased	46,600			31,765	206,802
Common stock, shares issued (in shares)								31,765	46,600
Sales Agreement [Member]
Security for sale offering						$ 34,500
Issuance of common stock, shares			9,000,000
Common stock, par value			$ 4.5
Proceeds from issuance of common stock under the employee stock purchase plan			$ 39,300

Fair Value Measurements - Additional Information (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Fair Value Disclosures [Abstract]
Transfers between level 3	$ 0	$ 0

Nature of Business and Basis of Presentation

3 Months Ended

Mar. 31, 2024

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Nature of the Business and Basis of Presentation

1. Nature of the Business and Basis of Presentation

Invivyd, Inc. (together with its consolidated subsidiaries, the “Company”), is a biopharmaceutical company devoted to delivering protection from serious viral infectious diseases, beginning with SARS-CoV-2. The Company’s proprietary INVYMAB™ platform approach combines state-of-the-art viral surveillance and predictive modeling with advanced antibody engineering. INVYMAB is designed to facilitate the rapid, serial generation of new monoclonal antibodies (“mAbs”) to address evolving viral threats.

On March 22, 2024, the Company received emergency use authorization (“EUA”) from the U.S. Food and Drug Administration (“FDA”) for PEMGARDA™ (pemivibart) injection, for intravenous use, a half-life extended investigational mAb, for the pre-exposure prophylaxis (prevention) of COVID-19 in adults and adolescents (12 years of age and older weighing at least 40 kg) who have moderate-to-severe immune compromise due to certain medical conditions or receipt of certain immunosuppressive medications or treatments and are unlikely to mount an adequate immune response to COVID-19 vaccination. Recipients should not be currently infected with or have had a known recent exposure to an individual infected with SARS-CoV-2.

In May 2024, the Company announced its intention to submit an EUA application to the FDA for pemivibart for the treatment of mild to moderate symptomatic COVID-19 in certain immunocompromised people utilizing a rapid immunobridging pathway, which was aligned in principle with the FDA and would leverage a similar approach as the Company used to achieve its current EUA for PEMGARDA for pre-exposure prophylaxis of COVID-19 in certain immunocompromised people. The immunobridging pathway for COVID-19 treatment is enabled by data from the Company’s previous Phase 2/3 clinical trial (STAMP) of adintrevimab, the prototype mAb, for the treatment of COVID-19 and data from the Company’s ongoing CANOPY Phase 3 clinical trial of VYD222 (pemivibart) for pre-exposure prophylaxis of COVID-19. The potential COVID-19 treatment EUA request would focus on the critical treatment needs of people in the U.S. who have moderate-to-severe immune compromise and for whom alternative COVID-19 treatment options are not clinically appropriate or accessible. Subsequent to the anticipated submission of an EUA request, the Company plans to initiate a compact clinical trial focused on confirmatory safety, pharmacokinetics, and clinical virology.

PEMGARDA is the Company’s first mAb in a planned series of innovative mAb candidates designed to keep pace with SARS-CoV-2 viral evolution. As the SARS-CoV-2 virus evolves over time, the Company anticipates leveraging its INVYMAB platform approach to periodically introduce new or engineered mAb candidates, an approach that would be analogous to the periodic updates made to influenza and COVID-19 vaccines. In January 2024, the Company nominated VYD2311, a mAb optimized for neutralization potency against recent SARS-CoV-2 lineages such as BA.2.86 and JN.1, as a drug candidate, and the Company expects it will be the next pipeline program to advance into clinical development. In addition to developing candidates for COVID-19, the Company expects to apply its INVYMAB platform approach to produce lead molecules for other viral diseases, such as influenza.

The Company was incorporated in the State of Delaware in June 2020. The Company operates as a hybrid company with employees working at its corporate headquarters in Waltham, Massachusetts and remotely. In June 2022, and subsequently amended in September 2022, the Company entered into a lease for dedicated laboratory and office space in Newton, Massachusetts for research and development purposes. In 2022, the Company expanded its research team in order to enable internal discovery and development of its mAb candidates, while continuing to leverage the Company’s existing partnership with Adimab, LLC (“Adimab”). The Company is focused on antibody discovery and use of Adimab’s platform technology while building its own internal capabilities. In addition, the Company performs research and development activities internally and engages third parties, including Adimab, to perform ongoing research and development and other services on its behalf.

The Company is subject to a number of risks and uncertainties common to companies in the biopharmaceutical industry, including, but not limited to, completing clinical trials, the ability to raise additional capital to fund operations, obtaining regulatory authorization or approval for product candidates, risks associated with market acceptance and commercialization of products, competition from other products, protection of proprietary intellectual property, compliance with government regulations, dependence on key personnel, the ability to attract and retain qualified employees, and reliance on third-party organizations for the discovery, manufacturing, clinical and commercial success of its product candidates.

Through March 31, 2024, the Company had not generated any revenue. To date, the Company has received regulatory authorization for only one product candidate, PEMGARDA, which has not been approved, but has been authorized for emergency use by the FDA under an EUA, for pre-exposure prophylaxis of COVID-19 in certain adults and adolescent individuals (12 years of age and older weighing at least 40 kg). Beyond VYD222 (pemivibart), all of the Company’s other product candidates, other than adintrevimab, are currently in preclinical development. The Company’s additional product candidates require significant additional research and development efforts, including extensive clinical testing, and regulatory authorization or approval prior to potential commercialization. These efforts require significant amounts of additional capital, adequate personnel and infrastructure and compliance-reporting capabilities. It is uncertain when, if ever, the Company will generate substantial revenue from product sales to be able to fund its operating expenses and capital requirements.

Substantial Doubt about Ability to Continue as a Going Concern

The accompanying condensed consolidated financial statements have been prepared on the basis of continuity of operations, realization of assets, and the satisfaction of liabilities and commitments in the ordinary course of business. The Company has primarily funded its operations with proceeds from sales of convertible preferred stock, proceeds from the Company’s initial public offering (“IPO”) and net proceeds received from shares of common stock solder under the Sales Agreement (defined below). In February 2024, the Company sold 9,000,000 shares of its common stock under the Sales Agreement at an average price of $4.50 per share for $39.3 million in net proceeds.

The Company has incurred losses and negative cash flows from operations since its inception, including a net loss of $43.5 million for the three months ended March 31, 2024. As of March 31, 2024, the Company had an accumulated deficit of $775.6 million. The Company may continue to generate operating losses for the foreseeable future.

Based on current operating plans and excluding any contribution from revenues or external financing, the Company will not have sufficient cash and cash equivalents to fund its operating expenses and capital requirements beyond one year from the issuance of these condensed consolidated financial statements, and therefore, the Company has concluded that there is substantial doubt about its ability to continue as a going concern.

The Company will require additional funding through a combination of contribution from revenues, equity offerings, government or private-party grants, debt financings or other capital sources, such as collaborations with other companies, strategic alliances or licensing arrangements to finance its future operations. The Company may not be able to obtain financing on acceptable terms, or at all, and the Company may not be able to enter into collaborations or other arrangements. The terms of any financing may adversely affect the holdings or rights of the Company’s stockholders.

If the Company is unable to obtain sufficient capital, the Company will be forced to delay, reduce or eliminate some or all of its research and development programs, product portfolio expansion or commercialization efforts, which could adversely affect its business prospects, or the Company may be unable to continue operations. Although management continues to pursue these plans, there is no assurance that the Company will be successful in obtaining sufficient funding on terms acceptable to the Company to fund continuing operations, if at all.

Basis of Presentation

The Company’s condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”). Any reference in these notes to applicable guidance is meant to refer to the authoritative U.S. GAAP as found in the Accounting Standards Codification (“ASC”) and Accounting Standards Update (“ASU”) of the Financial Accounting Standards Board (“FASB”).

The accompanying condensed consolidated financial statements include the accounts of Invivyd, Inc. and its wholly owned subsidiaries, Invivyd Security Corporation, Invivyd Switzerland GmbH, and Invivyd Netherlands B.V. All intercompany accounts and transactions have been eliminated in consolidation. The Company views its operations and manages its business in one operating segment, which is the business of discovering, developing and commercializing differentiated products for the prevention and treatment of infectious diseases.

Prepaid Expenses and Other Current Assets

3 Months Ended

Mar. 31, 2024

Prepaid Expense and Other Assets, Current [Abstract]

Prepaid Expenses and Other Current Assets

4. Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consisted of the following (in thousands):


	March 31, 2024		December 31, 2023
Prepaid external research, development and manufacturing costs	$	15,582	$	19,962
Prepaid insurance		1,141		1,770
Prepaid compensation and other		2,788		1,575
Interest receivable		875		933
	$	20,386	$	24,240

CONDENSED CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) (UNAUDITED) - USD ($) $ in Thousands	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income [Member]	Accumulated Deficit [Member]
Treasury Stock, Common, Shares			0
Balances at Dec. 31, 2022	$ 355,970	$ 11		$ 889,657	$ (272)	$ (533,426)
Balances, shares at Dec. 31, 2022		109,044,046
Treasury stock at Dec. 31, 2022			$ 0
Vesting of restricted common stock from early-exercised options	1			1
Exercise of stock options, shares		423,203
Exercise of stock options	459			459
Repurchase of unvested restricted common stock, shares		(206,802)	(206,802)
Stock-based compensation expense	5,400			5,400
Issuance of common stock under the employee stock purchase plan, shares		55,779
Issuance of common stock under the employee stock purchase plan	83			83
Retirement of treasury shares, shares			(206,802)
Unrealized gain on available-for-sale securities, net of tax	157				157
Net Income (Loss)	(35,321)					(35,321)
Balances at Mar. 31, 2023	326,749	$ 11		895,600	(115)	(568,747)
Balances, shares at Mar. 31, 2023		109,316,226
Treasury stock at Mar. 31, 2023			$ 0
Treasury Stock, Common, Shares			0
Treasury Stock, Common, Shares			0
Balances at Dec. 31, 2023	177,468	$ 11		909,539	(13)	(732,069)
Balances, shares at Dec. 31, 2023		110,160,684
Treasury stock at Dec. 31, 2023			$ 0
Stock-based compensation expense	5,379			5,379
Issuance of common stock under the employee stock purchase plan, shares		60,546
Issuance of common stock under the employee stock purchase plan	89			89
Issuance of common stock, net of issuance costs, Shares		9,000,000
Issuance of common stock, net of issuance costs, Value	39,057	$ 1		39,056
Unrealized gain on available-for-sale securities, net of tax	1				1
Net Income (Loss)	(43,496)					(43,496)
Balances at Mar. 31, 2024	$ 178,498	$ 12		$ 954,063	$ (12)	$ (775,565)
Balances, shares at Mar. 31, 2024		119,221,230
Treasury stock at Mar. 31, 2024			$ 0
Treasury Stock, Common, Shares			0

Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2024

Commitments and Contingencies Disclosure [Abstract]

Schedule of Components of Operating Lease Expense

The components of operating lease expense were as follows (in thousands):


	For the Three Months Ended March 31,		For the Three Months Ended March 31,
	2024		2023
Lease cost:
Operating lease cost	$	430	$	430
Variable lease cost		3		12
Total lease cost	$	433	$	442

Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows related to operating leases	$	435	$	432

Schedule of Future Minimum Payments Under Non-cancellable Purchase Obligations

Future minimum lease payments under the noncancelable leases as of March 31, 2024 was as follows (in thousands):


Year Ending December 31,	Operating Lease
2024 (excluding the three months ended March 31, 2024)		1,087
2025		430
2026		328
Total lease payments		1,845
Present value adjustment		(86	)
Present value of operating lease liability	$	1,759

Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2024

Share-Based Payment Arrangement [Abstract]

Schedule of Weighted Average Fair Values and Valuation Assumptions

The following table presents, on a weighted-average basis, the assumptions used in the Black-Scholes option-pricing model to determine the grant date fair value of stock options granted:


	Three Months Ended March 31,			Three Months Ended March 31,
	2024			2023
Expected term (in years)		5.8			5.8
Expected volatility		62.8	%		69.3	%
Risk-free interest rate		4.0	%		3.5	%
Expected dividend yield		—	%		—	%

Summary of Stock Option Activity

The following table summarizes the Company’s stock option activity since December 31, 2023:


	Number of Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term		Aggregate Intrinsic Value
						(in years)		(in thousands)
Outstanding at December 31, 2023		23,065,514		$	5.08		8.7	$	24,745
Granted		3,647,000		$	4.22
Exercised		—		$	—
Forfeited		(348,481	)	$	6.05
Outstanding at March 31, 2024		26,364,033		$	4.95		8.4	$	33,249
Vested and expected to vest at March 31, 2024		26,364,033		$	4.95		8.4	$	33,249
Options exercisable at March 31, 2024		9,143,369		$	6.79		7.4	$	9,256

Summary of Share Based Compensation Expense Recognized

The Company recorded stock-based compensation expense (service-based stock options and employee stock purchase plan) in the following expense categories of its condensed consolidated statements of operations and comprehensive loss (in thousands):


	Three Months Ended March 31,		Three Months Ended March 31,
	2024		2023
Research and development	$	1,677	$	2,263
Selling, general and administrative		3,702		3,137
	$	5,379	$	5,400

License and Collaboration Agreements - Additional Information (Details) - USD ($) $ in Thousands			1 Months Ended		3 Months Ended			12 Months Ended
	Jan. 01, 2024	Sep. 30, 2022	Mar. 31, 2023	Jul. 31, 2020	Mar. 31, 2024	Sep. 30, 2023	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2020
Preferred stock, shares issued (in shares)					0			0
Acquired IPR&D expense		$ 3,000
Quarterly fee	$ 600				$ 1,300
Delivery fee					200
Completion fee					200
Exercise fee					$ 1,000
Accrued Upfront Fee									$ 200
Royalty Based on Net Sales of Licensed Products, Percentage					1.00%
Royalty expense					$ 0
Research and Development [Member]
Quarterly fee					600		$ 1,300
Research Development And Regulatory Milestone
Potential milestone payment					18,000
Adimab Assignment Agreement [Member]
Milestone payment					$ 11,100			$ 11,100
Adimab Assignment Agreement [Member] \| Maximum [Member]
Potential milestone payment				$ 24,600
Royalty percentage of sublicense consideration					55.00%
Adimab Assignment Agreement [Member] \| Minimum [Member]
Royalty percentage of sublicense consideration					45.00%
Adimab Assignment Agreement [Member] \| Research and Development [Member]
Recognized expense					$ 0		0
Adimab Assignment Agreement [Member] \| Acquired In Process Research And Development Expense [Member]
Milestone payment			$ 400		0	$ 3,200	400
Adimab Assignment Agreement [Member] \| First Product [Member]
Potential milestone payment				16,500
Adimab Assignment Agreement [Member] \| Second Product [Member]
Potential milestone payment				$ 8,100
Adimab Collaboration Agreement [Member]
Expenses					0		200
Adimab Collaboration Agreement [Member] \| Research and Development [Member]
Quarterly fee					600		1,300
Adimab Collaboration Agreement [Member] \| Acquired In Process Research And Development Expense [Member]
Exercise fee					0		0
Adimab Platform Transfer Agreement [Member] \| Research Development And Regulatory Milestone
Potential milestone payment					9,500
Cell Line License Agreement [Member]
Acquired IPR&D expense					$ 0		$ 400

Commitments and Contingencies - Schedule of Components of Operating Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Lease cost
Operating lease cost	$ 430	$ 430
Variable lease cost	3	12
Total lease cost	433	442
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows related to operating leases	$ 435	$ 432

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (UNAUDITED) (PARENTHETICAL) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Research and Development Arrangement [Member]
Related party expenses	$ 1,135	$ 2,960
In Process Research and Development [Member]
Related party expenses	$ 0	$ 375

Summary of Significant Accounting Policies - Summary of the impact of the adoption (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Operating lease right-of-use asset	$ 1,827	$ 2,229
Operating lease liability, current	1,134	1,443
Operating lease liability, non-current	$ 625	$ 722

Stock-Based Compensation

3 Months Ended

Mar. 31, 2024

Share-Based Payment Arrangement [Abstract]

Share Based Compensation

10. Stock-Based Compensation

2020 Equity Incentive Plan

The Company’s 2020 Equity Incentive Plan (the “2020 Plan”) provides for the Company to grant incentive stock options, non-qualified stock options, restricted stock awards, restricted stock units and other stock-based awards to employees, members of the board of directors and consultants. The 2020 Plan is administered by the board of directors or, at the discretion of the board of directors, by a committee of the board of directors. The board of directors may also delegate to one or more officers of the Company the power to grant awards to employees and certain officers of the Company. The exercise prices, vesting and other restrictions are determined at the discretion of the board of directors, or its committee or any such officer if so delegated.

The exercise price for stock options granted may not be less than the fair market value of the Company’s common stock on the date of grant, as determined by the board of directors, or at least 110% of the fair market value of the Company’s common stock on the date of grant in the case of an incentive stock option granted to an employee who owns stock representing more than 10% of the voting power of all classes of stock as determined by the board of directors as of the date of grant. Prior to the IPO, the Company’s board of directors determined the fair value of the Company’s common stock, taking into consideration its most recently available valuation of common stock performed by third parties as well as additional factors which may have changed since the date of the most recent contemporaneous valuation through the date of grant. Stock options granted under the 2020 Plan expire after ten years and typically vest over a four-year period with the first 25% vesting upon the first anniversary of a specified vesting commencement date and the remainder vesting in 36 equal monthly installments over the succeeding three years, contingent on the recipient’s continued employment or service. Certain awards of stock options permit the holders to exercise the option in whole or in part prior to the full vesting of the option in exchange for unvested shares of restricted common stock with respect to any unvested portion of the option so exercised.

As of March 31, 2024, there were 4,298,068 shares authorized to be issued upon the exercise of outstanding stock option grants and no shares reserved for future issuance under the 2020 Plan.

2021 Equity Incentive Plan

In July 2021, the Company’s board of directors adopted, and its stockholders approved, the 2021 Equity Incentive Plan (the “2021 Plan”), which became effective immediately prior to and contingent upon the execution of the underwriting agreement related to the Company’s IPO. The 2021 Plan provides for the grant of incentive stock options, non-statutory stock options, stock appreciation rights, restricted stock awards, restricted stock units and other stock-based awards. The number of shares reserved for issuance under the 2021 Plan was equal to 35,075,122, which is the sum of 11,413,572 new shares; plus the number of shares (not to exceed 23,661,550 shares), which represents (i) the number of shares that remained available for issuance under the 2020 Plan, at the time the 2021 Plan became effective, and (ii) any shares subject to outstanding stock options or other stock awards that were granted under the 2020 Plan that are forfeited, terminate, expire or are otherwise not issued. In addition, the number of shares of the Company’s common stock reserved for issuance under the 2021 Plan will automatically increase on the first day of each calendar year pursuant to the evergreen provision thereof, beginning on January 1, 2022 and continuing through January 1, 2031, in an amount equal to 5% of the shares of common stock outstanding on the last day of the calendar month before the date of each automatic increase, or a lesser number of shares determined by the board of directors. On January 1, 2022, 5,539,145 shares of common stock were automatically added to the shares authorized for issuance under the 2021 Plan pursuant to the evergreen provision thereof. The number of shares to be issued under the 2021 Plan did not increase on January 1, 2023 as determined by the Company’s board of directors. On January 1, 2024, 3,304,820 shares of common stock were added to the shares authorized for issuance under the 2021 Plan, pursuant to the evergreen provision thereof, as determined by the Company’s board of directors. The shares of common stock underlying any awards that are forfeited, cancelled, held back upon exercise or settlement of an award to satisfy the exercise price or tax withholding, repurchased or are otherwise terminated by the Company under the 2021 Plan will be added back to the shares of common stock available for issuance under the 2021 Plan.

As of March 31, 2024, there were an aggregate of 45,301,059 shares authorized to be issued under the 2020 Plan and the 2021 Plan, which included 4,298,068 and 22,065,965 shares authorized to be issued upon the exercise of outstanding stock option grants from the 2020 Plan and 2021 Plan, respectively, and 0 and 18,937,026 shares reserved for future issuance under the 2020 Plan and 2021 Plan, respectively.

Stock Option Valuation

The fair value of stock option grants is estimated using the Black-Scholes option-pricing model. Prior to its IPO in August 2021, the Company had been a private company. Due to the proximity to the IPO, the Company continues to lack sufficient company-specific historical and implied volatility information. Therefore, it estimates its expected stock volatility based on the historical volatility of a publicly traded set of peer companies and expects to continue to do so until such time as it has adequate historical data regarding the volatility of its own traded stock price. For options with service-based vesting conditions, the expected term of the Company’s stock options has been determined utilizing the “simplified” method. The risk-free interest rate is determined by reference to the U.S. Treasury yield curve in effect at the time of grant of the award for time periods approximately equal to the expected term of the award. Expected dividend yield is based on the fact that the Company has never paid cash dividends and does not expect to pay any cash dividends in the foreseeable future.

The following table presents, on a weighted-average basis, the assumptions used in the Black-Scholes option-pricing model to determine the grant date fair value of stock options granted:


	Three Months Ended March 31,			Three Months Ended March 31,
	2024			2023
Expected term (in years)		5.8			5.8
Expected volatility		62.8	%		69.3	%
Risk-free interest rate		4.0	%		3.5	%
Expected dividend yield		—	%		—	%

Stock Option Activity

The following table summarizes the Company’s stock option activity since December 31, 2023:


	Number of Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term		Aggregate Intrinsic Value
						(in years)		(in thousands)
Outstanding at December 31, 2023		23,065,514		$	5.08		8.7	$	24,745
Granted		3,647,000		$	4.22
Exercised		—		$	—
Forfeited		(348,481	)	$	6.05
Outstanding at March 31, 2024		26,364,033		$	4.95		8.4	$	33,249
Vested and expected to vest at March 31, 2024		26,364,033		$	4.95		8.4	$	33,249
Options exercisable at March 31, 2024		9,143,369		$	6.79		7.4	$	9,256

The weighted-average grant date fair value of stock options granted during the three months ended March 31, 2024 and 2023 was $2.53 and $1.34, respectively, per share.

The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying options and the fair market value of the common stock for the options that had exercise prices lower than the estimated fair value of the Company’s common stock at March 31, 2024 and 2023.

The total intrinsic value of stock options exercised was $0 and $0.3 million for the three months ended March 31, 2024 and 2023, respectively.

Stock-Based Compensation Expense


	Three Months Ended March 31,		Three Months Ended March 31,
	2024		2023
Research and development	$	1,677	$	2,263
Selling, general and administrative		3,702		3,137
	$	5,379	$	5,400

As of March 31, 2024, total unrecognized stock-based compensation expense related to unvested stock-based awards was $40.2 million, which is expected to be recognized over a weighted-average period of 2.4 years.

2021 Employee Stock Purchase Plan

In July 2021, the Company’s board of directors adopted, and its stockholders approved, the 2021 Employee Stock Purchase Plan (the “2021 ESPP”), which became effective immediately prior to and contingent upon the execution of the underwriting agreement related to the Company’s IPO. A total of 1,342,773 shares of common stock were initially reserved for issuance under the 2021 ESPP. There were 351,542 shares issued under the 2021 ESPP as of March 31, 2024. The number of shares of common stock that may be issued under the 2021 ESPP will automatically increase on the first day of each calendar year, pursuant to the evergreen provision thereof, beginning on January 1, 2022 and continuing through January 1, 2031, by an amount equal to the lesser of (i) 1% of the shares of common stock outstanding on the last day of the calendar month before the date of each automatic increase, (ii) 2,685,546 shares and (iii) an amount determined by the Company’s board of directors. The number of shares to be issued under the 2021 ESPP did not increase on January 1, 2024 or January 1, 2023, pursuant to the evergreen provision thereof, as determined by the Company’s board of directors. The first offering under the 2021 ESPP was June 6, 2022. As of March 31, 2024, 991,231 shares remained available for issuance under the 2021 ESPP. During both the three months ended March 31, 2024 and 2023, the Company recognized less than $0.1 million in related stock-based compensation expense.

Warrant Expense

In November 2022, the Company entered into the PHP MSA, the PHP Work Order and a warrant agreement with respect to the PHP Warrant. To compensate for the services and deliverables provided by PHP, the Company issued 6,824,712 equity-classified warrants to PHP. Each warrant shall give the right to acquire common stock of the Company at a purchase price of $3.48 per share. Per the agreement, the PHP Warrant is exercisable upon either the achievement of corresponding market capitalization targets or a consummation of a fundamental transaction (as defined in the PHP Warrant); as such, there are no other requirements, including any continuous service requirements, in order for PHP to be entitled to the PHP Warrant, if and when any portion of it vests.

The aggregate grant date fair value of the PHP Warrant was $17.4 million, which was recognized as warrant expense on the grant date in November 2022.

There were no warrants issued during the three months ended March 31, 2024. As of March 31, 2024, there were 6,824,712 warrants outstanding at a weighted-average exercise price of $3.48, with a weighted-average remaining contractual term of 8.63 years.

Stock-Based Compensation - Additional Information (Details) $ / shares in Units, $ in Thousands			1 Months Ended			3 Months Ended
	Jan. 01, 2024 shares	Jan. 01, 2022 shares	Nov. 30, 2022 USD ($) $ / shares shares	Jul. 31, 2021 shares	Jul. 31, 2020	Mar. 31, 2024 USD ($) Installment $ / shares shares	Mar. 31, 2023 USD ($) $ / shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares of common stock authorized for issuance				2,685,546
Percentage of number of shares of common stock outstanding					1.00%
Intrinsic value of stock options exercised \| $						$ 0	$ 300
Fair value of common stock Per Share \| $ / shares						$ 2.53	$ 1.34
Liability for unvested shares \| $						$ 40,200
Unrecognized stock based compensation expense, Weighted average recognition period						2 years 4 months 24 days
Stock based compensation expense \| $						$ 5,379	$ 5,400
Class of Warrant or Right, Outstanding						6,824,712
Weighted average exercise price of Warrant Per Share \| $ / shares						$ 3.48
2020 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares of common stock authorized for issuance						4,298,068
Shares available for future issuance						0
Award vesting period						4 years
Percentage of options vesting						25.00%
Number of quarterly installments for vesting \| Installment						36
Share-based payment award, expiration period						10 years
Number of quarterly installments for vesting succeeding period						3 years
2020 Equity Incentive Plan \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant exercise price, percentage of estimated fair value of common stock on date of grant (not less than)						110.00%
Combined voting power on all classes of stock threshold						10.00%
2021 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares of common stock authorized for issuance				35,075,122		45,301,059
Issuance of common stock, shares	3,304,820	5,539,145		11,413,572
Percentage of number of shares of common stock outstanding				5.00%
2021 Equity Incentive Plan \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for future issuance				23,661,550
Two Thousand And Twenty Two Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for future issuance						991,231
Two Thousand And Twenty One Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares of common stock authorized for issuance				1,342,773		351,542
Shares available for future issuance						18,937,026
Stock based compensation expense \| $						$ 100	$ 100
Two Thousand And Twenty Employee Stock Purchase Plan Member
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for future issuance						0
PHP Warrants Outstanding [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Issuance of common stock, shares			6,824,712			0
Repurchased common stock, per share \| $ / shares			$ 3.48
Warrant expense \| $			$ 17,400
Class of Warrant or Right, Outstanding						6,824,712
Weighted average exercise price of Warrant Per Share \| $ / shares						$ 3.48
Weighted-average remaining contractual term (Years)						8 years 7 months 17 days
Share-Based Payment Arrangement, Option [Member] \| 2021 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares of common stock authorized for issuance						22,065,965
Share-Based Payment Arrangement, Option [Member] \| Two Thousand And Twenty Employee Stock Purchase Plan Member
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares of common stock authorized for issuance						4,298,068

Fair Value Measurements

3 Months Ended

Mar. 31, 2024

Fair Value Disclosures [Abstract]

Fair Value Measurements

3. Fair Value Measurements

Fair Value Measurements

Certain assets of the Company are carried at fair value under U.S. GAAP. Fair value is defined as the exchange price that would be received for an asset or an exit price that would be paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. Financial assets and liabilities carried at fair value are to be classified and disclosed in one of the following three levels of the fair value hierarchy, of which the first two are considered observable and the last is considered unobservable:


	•		Level 1 — Quoted prices in active markets for identical assets or liabilities.


	•		Level 2 — Observable inputs (other than Level 1 quoted prices), such as quoted prices in active markets for similar assets or liabilities, quoted prices in markets that are not active for identical or similar assets or liabilities, or other inputs that are observable or can be corroborated by observable market data.


	•		Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to determining the fair value of the assets or liabilities, including pricing models, discounted cash flow methodologies and similar techniques.

The Company’s cash equivalents are carried at fair value, determined according to the fair value hierarchy described above. The carrying values of the Company’s accounts payable and accrued expenses approximate their fair values due to the short-term nature of these liabilities.

The following tables present the Company’s fair value hierarchy for its assets and liabilities that are measured at fair value on a recurring basis (in thousands):


	Fair Value Measurements at March 31, 2024:
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	187,690	$	—	$	—	$	187,690
	$	187,690	$	—	$	—	$	187,690


	Fair Value Measurements at December 31, 2023:
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	198,193	$	—	$	—	$	198,193
	$	198,193	$	—	$	—	$	198,193

The money market funds were valued by the Company based on quoted market prices, which represent a Level 1 measurement within the fair value hierarchy.

There were no changes to the valuation methods during the three months ended March 31, 2024 or 2023.

The Company evaluates transfers between levels at the end of each reporting period. There were no transfers into or out of Level 1, Level 2 or Level 3 fair value measurements during the three months ended March 31, 2024 or 2023.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Accrued Expenses (Tables)

3 Months Ended

Mar. 31, 2024

Accrued Liabilities [Abstract]

Schedule of Accrued Expenses

Accrued expenses consisted of the following (in thousands):


	March 31, 2024		December 31, 2023
Accrued external research, development and manufacturing costs	$	29,139	$	28,151
Accrued professional and consultant fees		3,008		1,732
Accrued employee compensation		1,689		10,752
Other		167		225
	$	34,003	$	40,860

Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2024	May 02, 2024
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Mar. 31, 2024
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Entity Registrant Name	INVIVYD, INC.
Entity Central Index Key	0001832038
Current Fiscal Year End Date	--12-31
Entity File Number	001-40703
Entity Tax Identification Number	85-1403134
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	1601 Trapelo Road
Entity Address, Address Line Two	Suite 178
Entity Address, City or Town	Waltham
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02451
City Area Code	781
Local Phone Number	819-0080
Title of 12(b) Security	Common Stock, $0.0001 par value per share
Trading Symbol	IVVD
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		119,315,787

Net Loss Per Share - Basic and Diluted Net Loss Per Share Attributable to Common Stockholders (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Numerator
Net loss attributable to common stockholder	$ (43,496)	$ (35,321)
Denominator
Weighted-average common shares outstanding, basic	115,618,209	108,785,519
Weighted-average common shares outstanding, diluted	115,618,209	108,785,519
Net loss per share attributable to common stockholders, basic	$ (0.38)	$ (0.32)
Net loss per share attributable to common stockholders,diluted	$ (0.38)	$ (0.32)

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483443/250-10-50-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482635/260-10-55-15

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 1
-Subparagraph (e)(4)
-Publisher FASB
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+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

Net Loss Per Share - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Antidilutive Securities Excluded From Computation Of Earnings Per Share LineItems
Antidilutive securities excluded from computation of earnings per share, amount	33,188,745	30,801,970
Convertible Preferred Stock Member
Antidilutive Securities Excluded From Computation Of Earnings Per Share LineItems
Antidilutive securities excluded from computation of earnings per share, amount	6,824,712	6,824,712
Employee Stock Option [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share LineItems
Antidilutive securities excluded from computation of earnings per share, amount	26,364,033	23,883,782
Restricted Stock [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share LineItems
Antidilutive securities excluded from computation of earnings per share, amount	0	93,476

Defined Contribution Plan - Additional Information (Details) - 401(k) Plan - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Defined Contribution Plan Disclosure [Line Items]
Percentage of eligible participants of non-elective contributions	3.00%
Defined contribution amount	$ 0.2	$ 0.2

Stock-Based Compensation - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Outstanding	23,065,514
Granted	3,647,000
Forfeited	(348,481)
Outstanding at March 31, 2024	26,364,033	23,065,514
Vested and expected to vest at March 31, 2024	26,364,033
Options exercisable at March 31, 2024	9,143,369
Weighted-Average Exercise Price, Beginning Balance at December 31, 2023(Per Share)	$ 5.08
Weighted-Average Exercise Price, Granted	4.22
Weighted-Average Exercise Price,Forfeited	6.05
Weighted-Average Exercise Price, Ending Balance at June 30, 2023 (Per Share)	4.95	$ 5.08
Weighted-Average Exercise Price,Vested and expected to vest at March 31, 2024	4.95
Weighted-Average Exercise Price,Options exercisable at March 31, 2024	$ 6.79
Weighted Average Remaining Contractual Term (In Years)	8 years 4 months 24 days	8 years 8 months 12 days
Weighted Average Remaining Contractual Term, Vested and Expected to vest at March 31, 2024	8 years 4 months 24 days
Weighted Average Remaining Contractual Term, Exercisable at JMarch 31, 2024	7 years 4 months 24 days
Aggregate Intrinsic Value, Outstanding at March 31, 2024	$ 24,745
Aggregate Intrinsic Value, Outstanding at June 30, 2023	33,249	$ 24,745
Aggregate Intrinsic Value, Vested and Expected to vest at JMarch 31, 2024	33,249
Aggregate Intrinsic Value, Exercisable at March 31, 2024	$ 9,256

Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Accrued Liabilities [Abstract]
Accrued external research, development and manufacturing costs	$ 29,139	$ 28,151
Accrued professional and consultant fees	3,008	1,732
Accrued employee compensation	1,689	10,752
Other	167	225
Accrued expenses	$ 34,003	$ 40,860

Related Party Transactions - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended
	Jan. 01, 2024	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Related Party Transaction [Line Items]
Quarterly fee	$ 600	$ 1,300
Research and Development Expense [Member]
Related Party Transaction [Line Items]
Quarterly fee		600	$ 1,300
Adimab Assignment Agreement [Member] \| IPR&D Expense [Member]
Related Party Transaction [Line Items]
Related Party Transaction Expenses From Transaction With Related Party		0	400
Adimab Assignment Agreement [Member] \| Research and Development Expense [Member]
Related Party Transaction [Line Items]
Related Party Transaction Expenses From Transaction With Related Party		0	0
Adimab [Member]
Related Party Transaction [Line Items]
Due To Related Parties		700		$ 700
Due from Related Party		0		$ 0
Adimab Collaboration Agreement [Member] \| Research and Development Expense [Member]
Related Party Transaction [Line Items]
Related Party Transaction Expenses From Transaction With Related Party		0	200
Quarterly fee		600	1,300
PHP Member
Related Party Transaction [Line Items]
Related Party Transaction Expenses From Transaction With Related Party			$ 1,500
Due from Related Party		0
Maximum [Member] \| Adimab Assignment Agreement [Member] \| Research and Development Expense [Member]
Related Party Transaction [Line Items]
Related Party Transaction Expenses From Transaction With Related Party		$ 100

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 189,388	$ 200,641
Inventory	109	0
Prepaid expenses and other current assets	20,386	24,240
Total current assets	209,883	224,881
Property and equipment, net	1,901	1,896
Operating lease right-of-use asset	1,827	2,229
Other non-current assets	1,857	175
Total assets	215,468	229,181
Current liabilities:
Accounts payable	1,168	7,953
Accrued expenses	34,003	40,860
Operating lease liability, current	1,134	1,443
Other current liability	40	35
Total current liabilities	36,345	50,291
Operating lease liability, non-current	625	722
Other non-current liability	0	700
Total liabilities	36,970	51,713
Commitments and contingencies (Note 8)
Stockholders' equity (deficit):
Preferred stock (undesignated), $0.0001 par value; 10,000,000 shares authorized and no shares issued and outstanding at March 31, 2024 and December 31, 2023	0	0
Common stock, $0.0001 par value; 1,000,000,000 shares authorized, 119,221,230 shares issued and outstanding at March 31, 2024; 110,160,684 shares issued and outstanding at December 31, 2023	12	11
Additional paid-in capital	954,063	909,539
Accumulated other comprehensive loss	(12)	(13)
Accumulated deficit	(775,565)	(732,069)
Total stockholders' equity	178,498	177,468
Total liabilities, preferred stock and stockholders' equity	$ 215,468	$ 229,181