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Stock-Based Compensation

9 Months Ended

Sep. 30, 2024

Share-Based Payment Arrangement [Abstract]

Stock-Based Compensation

8. Stock-Based Compensation

Stock Options

Activities for the Company’s stock option plans for the nine months ended September 30, 2024 were as follows:


	Options Outstanding
	Number of Options			Weighted- Average Exercise Price Per Share
Balance at December 31, 2023		12,949,612		$	7.16
Options granted		2,371,000			1.70
Options exercised		(132,351	)		1.58
Option forfeited/expired		(618,940	)		10.20
Balance at September 30, 2024		14,569,321		$	6.19

The Company recorded $1.5 million and $0.5 million of stock-based compensation expense related to the stock options for the three months ended September 30, 2024 and 2023, respectively.

The Company recorded $4.4 million and $4.1 million of stock-based compensation expense related to the stock option plans for the nine months ended September 30, 2024 and 2023, respectively.

Time-based RSUs ("TRSU")

Activities for the Company’s TRSUs for the nine months ended September 30, 2024 were as follows:


	Number of Shares			Weighted Average Grant Date Fair Value Per Share

Balance at December 31, 2023		1,400,529		$	2.40
RSU's awarded		1,195,833			1.64
RSU's vested		(706,923	)		2.14
RSU's cancelled		(73,929	)		1.82
Balance at September 30, 2024		1,815,510		$	2.02

The Company recorded $0.4 million and $0.5 million of stock-based compensation expense related to the TRSUs for the three months ended September 30, 2024 and 2023, respectively.

The Company recorded $1.1 million and $1.5 million of stock-based compensation expense related to the TRSUs for the nine months ended September 30, 2024 and 2023, respectively.

Performance-based RSUs ("PSUs")

2022 PSU

In August 2022, the Company granted 250,000 PSUs to executive employees with an aggregated grant date fair value of approximately $0.4 million. Vesting for 50% of the PSUs granted was set to occur upon attaining certain specific milestones by December 2023 (“2022-Tranche 1”), and the remaining 50% are set to vest upon attaining certain specific milestones by December 2024 (“2022-Tranche 2”). In December 2023, the Company determined that the performance conditions for 2022-Tranche 1 was satisfied and the award was vested in December 2023. As a result, the Company recorded $55,000 and the remaining $128,000 compensation cost for the 2022-Tranche 1 award for the year ended December 31, 2022 and 2023, respectively. In August 2024, the Company determined that the performance conditions for the 2022-Tranche 2 had been satisfied and the award was vested in August 2024. As a result the Company recorded $38,000 and $77,000 compensation cost for the three and nine months ended September 30, 2024 and $106,000 for the fiscal year 2023, respectively.

2023 PSU

In February 2023, the Company granted 760,000 PSUs to executive employees with an aggregated grant date fair value of approximately $1.9 million. Vesting for 50% of the PSUs granted will occur upon attaining certain specific milestones by December 2024 (“2023-Tranche 1”), and the remaining 50% will vest upon attaining certain specific milestones by December 2025 (“2023-Tranche 2”). The Company determined that it is not probable that the performance conditions will be satisfied for each of these tranches and hence no compensation cost was recorded for these awards through September 30, 2024.

2024 PSU

In January 2024, the Company granted 810,000 PSUs to executive employees with an aggregated grant date fair value of approximately $1.3 million. Vesting for 50% of the PSUs granted will occur upon attaining certain specific milestones by December 2025 (“2024-Tranche 1”), and the remaining 50% will vest upon attaining certain specific milestones by December 2026 (“2024-Tranche 2”). The Company determined that it is not probable that the performance conditions will be satisfied for each of these tranches and hence no compensation cost was recorded for these awards through September 30, 2024.

Activities for the Company’s PSUs for the nine months ended September 30, 2024, were as follows:


	Number of Shares			Weighted Average Grant Date Fair Value Per Share

Balance at December 31, 2023		875,000		$	2.41
PSU's awarded		810,000			1.66
PSU's released		(115,000	)		1.59
Balance at September 30, 2024		1,570,000		$	2.09

Stock-based Compensation

Total stock-based compensation recorded was as follows:


	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2024		2023		2024		2023
	(in thousands)				(in thousands)
Research and development	$	691	$	126	$	2,054	$	2,001
General and administrative		1,304		1,100		3,730		4,005
Total stock-based compensation expense	$	1,995	$	1,226	$	5,784	$	6,006

Common Stock (Tables)

9 Months Ended

Sep. 30, 2024

Warrants and Rights Note Disclosure [Abstract]

Summary of Company's warrants

The following table summarizes the Company's outstanding warrants as of September 30, 2024:


	Pre-funded Warrants				Tranche 1 Warrants				Tranche 2 Warrants
	Number of warrants		Weighted- Average Exercise Price Per Share		Number of warrants		Weighted- Average Exercise Price Per Share		Number of warrants		Weighted- Average Exercise Price Per Share

Warrants Outstanding		6,923,077	$	0.00001		5,769,231	$	4.16		5,769,231	$	6.24

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Pay vs Performance Disclosure
Net Income (Loss)	$ 5,736	$ (6,534)	$ 13,791	$ 2,992	$ (1,087)	$ (3,311)	$ 12,993	$ (1,406)

- 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

Fair Value Measurements and Investments (Tables)

9 Months Ended

Sep. 30, 2024

Fair Value Disclosures [Abstract]

Schedule of Investments Subject to Fair Value Measurements on a Recurring Basis

The following tables set forth the fair value of the Company’s investments subject to fair value measurements on a recurring basis and the level of inputs used in such measurements:


		September 30, 2024
	Valuation Hierarchy	Amortized Cost		Gross Unrealized Gains		Aggregate Fair Value
		(in thousands)
Assets
Money market funds	Level I	$	28,212	$	—	$	28,212
Restricted cash (money market funds)	Level I		1,027		—		1,027
U.S. Treasury Securities	Level II		89,349		40		89,389
Total		$	118,588	$	40	$	118,628


		December 31, 2023
	Valuation Hierarchy	Amortized Cost		Gross Unrealized Gains		Aggregate Fair Value
		(in thousands)
Assets
Money market funds	Level I	$	17,109	$	—	$	17,109
Restricted cash (money market funds)	Level I		917		—		917
U.S. Treasury Securities	Level II		157,243		95		157,338
Total		$	175,269	$	95	$	175,364

Collaboration and License Agreements - Bristol-Myers Squibb Company - Additional Information (Details) $ in Thousands			1 Months Ended	9 Months Ended
	Apr. 25, 2017 USD ($) Target	Jul. 07, 2014 USD ($) Term Target	Jan. 31, 2018 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Mar. 17, 2017 Target
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Deferred revenue				$ 129,619	$ 212,315	$ 236,657	$ 301,326
Bristol Myers Squibb
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Deferred revenue				$ 63,900
Collaboration and License Agreement \| Maximum \| Bristol Myers Squibb
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Number of additional collaboration target \| Target								8
Collaborative Arrangement \| Bristol Myers Squibb
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Collaboration target research term		2 years
Number of additional collaboration target \| Target		2
Research terms				Each collaboration target had a two-year research term and the two additional targets had to be nominated by Bristol Myers Squibb within five years of the effective date of the BMS Agreement. The research term for each collaboration target could be extended in one year increments up to three times.
Extension of research term for each collaboration target		1 year
Upfront payment received	$ 200,000	$ 50,000
Contingent milestone payments receivable				$ 1,300,000
Number of research targets selected \| Target	8
Total transaction price		304,700
Upfront fee received		250,000
Research and development service fees		17,700
Milestone payment received			$ 12,000
Deferred revenue				$ 63,900	$ 119,900
Collaborative Arrangement \| Bristol Myers Squibb \| Third And Fourth Target
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Target selection fee		$ 25,000
Collaborative Arrangement \| Maximum \| Bristol Myers Squibb
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Number of oncology target \| Target		4
Number of collaboration target \| Target		2
Period of nomination of additional target from effective date		5 years
Times of increments for extended collaboration target research time \| Term		3
Collaborative Arrangement \| Maximum \| Bristol Myers Squibb \| Each Of Two Additional Targets
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Contingent milestone payments receivable		$ 25,000

Income Taxes

9 Months Ended

Sep. 30, 2024

Income Tax Disclosure [Abstract]

Income Taxes

11. Income Taxes

The Company maintains a full valuation allowance against its net deferred tax assets due to the Company’s history of losses through December 31, 2023.

The Company files income taxes in the U.S. federal jurisdiction, the state of California and various other U.S. states. The state of California contested the Company’s tax position on revenue apportionment for upfront and milestone payments resulting from the Company’s collaboration and licensing agreements for the years 2017 and 2018. In September 2023, the Company received Notice of Proposed Assessment (“NOPA”) from the Franchise Tax Board. The Company recorded an uncertain tax position of $4.1 million in long term liabilities for the proposed tax assessment, penalties and interest through September 30, 2024. Of the unrecognized tax benefits as of September 30, 2024, approximately $4.1 million would affect the Company’s effective tax rate if recognized. In addition, utilization of carryforward attributes and indirect federal tax effects of the assessment would result in a reduction in deferred tax assets of $5.1 million. The Company filed a protest to contest the proposed assessment in November 2023. Due to the ongoing nature of the examination and discussions with the state of California, the Company is unable to estimate a date by which this matter will be resolved.

- Definition

The entire disclosure for income tax.

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-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 11.C)
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-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482603/740-30-50-2

+ Details

Stock-Based Compensation - Schedule of Activities Under Company's Stock Option Plans (Details)	9 Months Ended
	Sep. 30, 2024 $ / shares shares
Number of Options
Balance,beginning of the period \| shares	12,949,612
Options granted \| shares	2,371,000
Options exercised \| shares	(132,351)
Option forfeited/expired \| shares	(618,940)
Balance, end of the period \| shares	14,569,321
Options Outstanding, Weighted-Average Exercise Price Per Share
Balances, beginning of the period \| $ / shares	$ 7.16
Options granted \| $ / shares	1.7
Options exercised \| $ / shares	1.58
Option forfeited/expired \| $ / shares	10.2
Balances, end of the period \| $ / shares	$ 6.19

Common Stock

9 Months Ended

Sep. 30, 2024

Equity [Abstract]

Common Stock

7. Common Stock

In February 2020, the Company entered into the Open Market Sale Agreement (as amended on each of March 4, 2022 and August 9, 2024, the “Sales Agreement”) with Jefferies LLC (“Jefferies”), to sell its common stock, at par value $0.00001 per share, with aggregate gross sales proceeds of up to $75,000,000, from time to time upon the Company’s request, through an at the market offering under which Jefferies will act as sales agent. Pursuant to the Sales Agreement, Jefferies as the sales agent will receive a commission of 3.0% of the gross sales price for shares of common stock sold under the Sales Agreement. In April 2024, under the Sales Agreement, the Company sold 2,270,608 shares at an average price of $2.20 per share and received net proceeds of approximately $4.8 million after deducting the 3.0% sales commission and related issuance cost.

In June 2023, the Company entered into an agreement with BVF Partners L.P. (“BVF”) for a private placement and received an aggregate net proceeds of approximately $29.7 million in July 2023, after deducting issuance costs of approximately $0.3 million. In the private placement, CytomX issued pre-funded warrants to BVF to purchase up to 14,423,077 shares of common stock, accompanying Tranche 1 warrants to purchase up to 5,769,231 shares of common stock and accompanying Tranche 2 warrants to purchase up to 5,769,231 shares of common stock, at a combined price of $2.08 per share. On May 1, 2024, BVF exercised its right to purchase 7.5 million shares of common stock through its pre-funded warrants at an exercise price of $0.00001 per share.

The following table summarizes the Company's outstanding warrants as of September 30, 2024:


	Pre-funded Warrants				Tranche 1 Warrants				Tranche 2 Warrants
	Number of warrants		Weighted- Average Exercise Price Per Share		Number of warrants		Weighted- Average Exercise Price Per Share		Number of warrants		Weighted- Average Exercise Price Per Share

Warrants Outstanding		6,923,077	$	0.00001		5,769,231	$	4.16		5,769,231	$	6.24

In the May 2024 annual meeting of stockholders, the Company's authorized shares of common stock were approved to increase from 150,000,000 shares to 300,000,000 shares.

Collaboration and License Agreements - Schedule of Revenue by Collaboration Partners (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue	$ 33,432	$ 26,384	$ 100,010	$ 74,607
AbbVie
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue	0	0	0	3,988
Amgen
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue	(783)	1,627	1,491	5,124
Astellas
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue	2,553	4,630	23,497	18,685
Bristol Myers Squibb
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue	22,977	14,028	56,042	35,630
Regeneron
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue	2,896	2,913	7,925	5,249
Moderna
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue	$ 5,789	$ 3,186	$ 11,055	$ 5,931

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

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+ Details

Net Income (Loss) Per Share - Summary of Potentially Dilutive Securities Excluded from Computation of Diluted Net Loss Per Share (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	27,860,294	25,910,111	26,018,980	19,426,965
RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,738,213	884,232	217,727	1,659,636
Options and ESPP to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	14,583,619	13,863,671	14,262,791	14,046,593
Common stock warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	11,538,462	11,162,208	11,538,462	3,720,736

Basis of Presentation and Summary of Significant Accounting Policies

9 Months Ended

Sep. 30, 2024

Accounting Policies [Abstract]

Basis of Presentation and Summary of Significant Accounting Policies

2. Basis of Presentation and Summary of Significant Accounting Policies

Basis of Presentation

The accompanying interim condensed financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and applicable rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) regarding interim financial reporting.

Unaudited Interim Financial Information

The accompanying interim condensed financial statements and related disclosures are unaudited, have been prepared on the same basis as the annual financial statements and, in the opinion of management, reflect all adjustments, which include only normal recurring adjustments, necessary for a fair statement of the results of operations for the periods presented.

The condensed results of operations for the three and nine months ended September 30, 2024 are not necessarily indicative of the results to be expected for the full year or for any other future year or interim period. The accompanying condensed financial statements should be read in conjunction with the audited financial statements and the related notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023 filed with the SEC.

Use of Estimates

The preparation of the financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent liabilities at the date of the financial statements and reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates.

Cash, Cash Equivalents and Restricted Cash

The Company considers all highly liquid investments purchased with original maturities of three months or less at the date of purchase to be cash equivalents. Restricted cash represents a standby letter of credit issued pursuant to an office lease and value added tax return.

Revenue Recognition

The Company’s revenues are primarily derived through its license, research, development and commercialization agreements. The terms of these types of agreements may include (i) licenses for the Company’s technology or programs, (ii) research and development services, and (iii) services or obligations in connection with participation in research or steering committees. Payments to the Company under these arrangements typically include one or more of the following: non-refundable upfront and license fees, research funding, milestone and other contingent payments to the Company for the achievement of defined collaboration objectives and certain preclinical, clinical, regulatory and sales-based events, as well as royalties on sales of any commercialized products.

The Company assesses whether the promises in its arrangements with customers are distinct performance obligations that should be accounted for separately. Judgment is required to determine whether the license to the Company’s intellectual property is distinct from the research and development services or participation on steering committees.

The Company’s collaboration and license agreements may include contingent payments related to specified research, development and regulatory milestones. Such milestone payments are typically payable under the collaborations when the collaboration partner claims or selects a target, or initiates or advances a covered product candidate in preclinical or clinical development, upon submission for marketing

approval of a covered product with regulatory authorities, or upon receipt of actual marketing approvals of a covered product or for additional indications. Milestone payments that are not within the control of the Company or the licensee, such as regulatory approvals, are not considered probable of being achieved until those approvals are received. At each reporting date, the Company re-evaluates whether the milestones are considered probable of being achieved and estimates the amount to be included in the transaction price by using the most likely amount method. If it is probable that a significant revenue reversal would not occur, the associated milestone value is included in the transaction price in such period of determination.

The Company’s collaboration and license agreements may also include contingent payments related to sales-based milestones. Sales-based milestones are typically payable when annual sales of a covered product reach specified levels. Sales-based milestones are recognized at the later of when the associated performance obligation has been satisfied or when the sales occur. Unlike other contingency payments, such as regulatory milestones, sales-based milestones are not included in the transaction price based on estimates at the inception of the contract; instead, they are included when the sales or usage occur.

Due to the early stage of the Company’s licensed technology, the license of such technology is typically combined with research and development services and steering committee participation as one performance obligation. Under the collaboration and license agreements, each collaboration target or program is generally considered to be a separate combined performance obligation. The transaction price in each arrangement is allocated to the identified performance obligations based on the relative standalone selling price (“SSP”) of each distinct performance obligation, which requires judgment. In instances where SSP is not directly observable, such as when a license or service is not sold separately, SSP is determined using information that may include market conditions and other observable inputs. Variable consideration is allocated to certain performance obligations if it is triggered by the Company’s efforts to satisfy or a specific outcome from satisfying these performance obligations. In the event that the Company receives non-cash consideration such as consideration in the form of a research license and research support services from the counterparty, the transaction price of a non-monetary exchange that has commercial substance is estimated based on the fair value of the non-cash consideration received, which may be determined through a valuation analysis. The Company recognizes revenue from upfront payments over the estimated period of performance under the agreement using an input method for the performance obligation. In applying the input method of revenue recognition, the Company uses actual full-time equivalent (FTE) hours incurred relative to estimated total FTE hours expected to be incurred for each combined performance obligation over the estimated research service period of each collaboration target.

In certain cases, the Company’s performance creates an asset that does not have an alternative use to the customer and the Company has an enforceable right to payment at all times for performance completed to date. In these cases, the Company utilizes judgment to assess the nature of the combined performance obligation to determine whether the combined performance obligation is satisfied over time or at a point in time and, if over time, the appropriate method of measuring progress for purposes of recognizing revenue. The Company evaluates the measure of progress each reporting period and, if necessary, adjusts the measure of performance and related revenue recognition.

Any consideration payable to the Company’s customers is treated as a reduction to the transaction price and revenue, unless the payment to the customer is in exchange for distinct good and services.

Contract Balances

Customer payments are recorded as deferred revenue upon receipt or when due and may require deferral of revenue recognition to a future period until the Company satisfies its performance obligations under these arrangements. Amounts payable to the Company are recorded as accounts receivable when the Company’s right to consideration is unconditional.

Segment

The Company derives revenues through its collaboration and license agreements and determined that it operates as a single reportable segment which primarily focus on clinical and pre-clinical research programs. The Chief Operating Decision Maker ("CODM") primarily reviews the Company’s financial information on an aggregate basis. All long-lived assets are maintained in the United States of America.

Recent Accounting Pronouncements

In November 2023, the FASB issued ASU 2023-07, Segment Reporting - Improvements to Reportable Segment Disclosures ("ASU 2023-07"), which enhances transparency in income tax disclosures. ASU 2023-07 requires entities to provide incremental disclosures, if applicable, related to a public entity's reportable segments but does not change the definition of a segment, the method for determining segments, or the criteria for aggregating operating segments into reportable segment. ASU 2023-07 improves reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses, which enable users of financial statements to better understand

the entity's measurement and assessment of segment performance and resource allocation. The new guidance is effective for public entities for fiscal years beginning after December 15, 2023, and interim periods in fiscal years beginning after December 15, 2024. The Company will adopt the ASU for its 2024 Form 10-K. The ASU is required to be applied on a retrospective basis. The Company is evaluating the impact on its financial statements.

In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures ("ASU 2023-09"), which enhances transparency in income tax disclosures. ASU 2023-09 require entities to disclose (1) specific categories in the rate reconciliation, (2) the income or loss from continuing operations before income tax expense or benefit (separated between domestic and foreign) and (3) income tax expense or benefit from continuing operations (separated by federal, state and foreign). ASU 2023-09 also requires entities to disclose their income tax payments to international, federal, state and local jurisdictions, among other changes. The Company will adopt the ASU for its 2025 Form 10-K on a prospective basis. The Company is evaluating the impact on its financial statements.

Stock-Based Compensation - Total Stock-based Compensation Recognized (Details) - Stock Compensation Plan - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 1,995	$ 1,226	$ 5,784	$ 6,006
Research and development
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	691	126	2,054	2,001
General and administrative
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 1,304	$ 1,100	$ 3,730	$ 4,005

- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Collaboration and License Agreements - ModernaTX, Inc - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended
	Jan. 31, 2023	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Deferred revenue		$ 129,619	$ 212,315	$ 236,657	$ 301,326
ModernaTX, Inc
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Deferred revenue		14,200
ModernaTX, Inc \| Collaboration and License Agreement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Upfront payment received	$ 35,000
Up front consideration pre paid research and development service fees	5,000
Deferred revenue		14,200	24,200
Amount due from customer		$ 1,100	$ 0
ModernaTX, Inc \| Collaboration and License Agreement \| Maximum
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Contingent milestone payments receivable	$ 1,200,000

Stock-Based Compensation - Schedule of Company's TRSU Activities (Details) - Time based RSUs	9 Months Ended
	Sep. 30, 2024 $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Balance at December 31, 2023 \| shares	1,400,529
Units awarded \| shares	1,195,833
Units vested \| shares	(706,923)
units cancelled \| shares	(73,929)
Balance at September 30, 2024 \| shares	1,815,510
Balance at December 31, 2023 \| $ / shares	$ 2.4
Units Awarded \| $ / shares	1.64
Units vested \| $ / shares	2.14
Units cancelled \| $ / shares	1.82
Balance at September 30, 2024 \| $ / shares	$ 2.02

Fair Value Measurements and Investments - Schedule of Investments Subject to Fair Value Measurements on a Recurring Basis (Details) - USD ($)
$ in Thousands

Sep. 30, 2024

Dec. 31, 2023

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

Cash and cash equivalents

$ 40,576

$ 17,171

^[1]

Aggregate Fair Value

118,628

175,364

Gross Unrealized Holding Gains

Amortized Cost

118,588

175,269

Level I | Money market funds

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

Cash and cash equivalents

28,212

17,109

Level I | Restricted cash (money market funds)

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

Restricted cash

1,027

917

Level II | U.S. Treasury Securities

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

Investments, Amortized Cost

89,349

157,243

Investments, Gross Unrealized Gains

Investments, Aggregate Fair Value

$ 89,389

$ 157,338

[1]	The condensed balance sheet as of December 31, 2023 was derived from the audited financial statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2023.

Accrued Liabilities

9 Months Ended

Sep. 30, 2024

Accrued Liabilities, Current [Abstract]

Accrued Liabilities

5. Accrued Liabilities

Accrued liabilities consisted of the following:


	September 30,		December 31,
	2024		2023
	(in thousands)
Research and clinical expenses	$	7,366	$	8,435
Payroll and related expenses		7,410		8,160
Legal and professional expenses		1,674		690
Other accrued expenses		292		314
Total	$	16,742	$	17,599

Collaboration and License Agreements - AbbVie Ireland Unlimited Company - Additional Information (Details) $ in Thousands	1 Months Ended
	Apr. 30, 2016 USD ($) Agreement	Sep. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Deferred revenue		$ 129,619	$ 212,315	$ 236,657		$ 301,326
AbbVie Ireland Unlimited Company \| Collaborative Arrangement
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Number of collaboration agreements \| Agreement	2
AbbVie Ireland Unlimited Company \| CD71 Agreement
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Milestone payments received	$ 100,000
Deferred revenue					$ 4,000

Income Taxes - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2024
Income Tax Disclosure [Abstract]
Unrecognized tax benefits,income tax penalties and interest expense		$ 4.1
Unrecognized tax benefits would affect company's effective tax rate		$ 4.1
Deferred tax asset, net change in total valuation allowance increase during period	$ 5.1

Accrued Liabilities (Tables)

9 Months Ended

Sep. 30, 2024

Accrued Liabilities, Current [Abstract]

Schedule of Accrued Liabilities

Accrued liabilities consisted of the following:


	September 30,		December 31,
	2024		2023
	(in thousands)
Research and clinical expenses	$	7,366	$	8,435
Payroll and related expenses		7,410		8,160
Legal and professional expenses		1,674		690
Other accrued expenses		292		314
Total	$	16,742	$	17,599

CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Revenues	$ 33,432	$ 26,384	$ 100,010	$ 74,607
Type of Revenue [Extensible List]	us-gaap:LicenseAndServiceMember	us-gaap:LicenseAndServiceMember	us-gaap:LicenseAndServiceMember	us-gaap:LicenseAndServiceMember
Operating expenses:
Research and development	$ 21,368	$ 16,448	$ 68,592	$ 58,294
General and administrative	7,953	6,813	24,102	22,191
Total operating expenses	29,321	23,261	92,694	80,485
Income (loss) from operations	4,111	3,123	7,316	(5,878)
Interest income	1,693	2,699	5,858	7,334
Other (expense) income, net	(7)	(7)	(19)	(39)
Income before income taxes	5,797	5,815	13,155	1,417
Provision for income taxes	61	2,823	162	2,823
Net income (loss)	5,736	2,992	12,993	(1,406)
Other comprehensive income (loss):
Unrealized gain (loss) on investments, net of tax	44	(98)	(55)	(73)
Total comprehensive income (loss)	$ 5,780	$ 2,894	$ 12,938	$ (1,479)
Net income (loss) per share, Basic	$ 0.07	$ 0.04	$ 0.15	$ (0.02)
Net income (loss) per share, Diluted	$ 0.07	$ 0.04	$ 0.15	$ (0.02)
Shares used to compute net income (loss) per share, Basic	85,093,227	80,731,951	84,005,093	71,225,433
Shares used to compute net income (loss) per share, Diluted	85,204,709	80,991,722	84,428,843	71,225,433

CONDENSED STATEMENTS OF STOCKHOLDERS' DEFICIT - USD ($)
$ in Thousands

Total

Common Stock

Additional Paid-in Capital

Accumulated Other Comprehensive Income (Loss)

Accumulated Deficit

Beginning balance at Dec. 31, 2022

$ (85,751)

$ 1

$ 637,117

$ 10

$ (722,879)

Beginning balance, shares at Dec. 31, 2022

66,228,046

Release of RSUs, shares

110,892

Stock-based compensation

2,409

Other comprehensive income (loss)

Net Income (Loss)

(3,311)

Ending balance at Mar. 31, 2023

(86,637)

$ 1

639,526

(726,190)

Ending balance, shares at Mar. 31, 2023

66,338,938

Beginning balance at Dec. 31, 2022

(85,751)

$ 1

637,117

(722,879)

Beginning balance, shares at Dec. 31, 2022

66,228,046

Other comprehensive income (loss)

(73)

Net Income (Loss)

(1,406)

Ending balance at Sep. 30, 2023

(51,238)

$ 1

673,109

(63)

(724,285)

Ending balance, shares at Sep. 30, 2023

66,872,779

Beginning balance at Mar. 31, 2023

(86,637)

$ 1

639,526

(726,190)

Beginning balance, shares at Mar. 31, 2023

66,338,938

Exercise of stock options, shares

16,535

Exercise of stock options

Release of RSUs, shares

212,312

Issuance of common stock under the ESPP, shares

199,994

Issuance of common stock under the ESPP

291

Stock-based compensation

2,371

Other comprehensive income (loss)

Net Income (Loss)

(1,087)

Ending balance at Jun. 30, 2023

(85,027)

$ 1

642,214

(727,277)

Ending balance, shares at Jun. 30, 2023

66,767,779

Release of RSUs, shares

105,000

Issuance of pre-funded warrants and warrants, net of issuance cost

29,669

Stock-based compensation

1,226

Other comprehensive income (loss)

(98)

Net Income (Loss)

2,992

Ending balance at Sep. 30, 2023

(51,238)

$ 1

673,109

(63)

(724,285)

Ending balance, shares at Sep. 30, 2023

66,872,779

Beginning balance at Dec. 31, 2023

(47,447)

^[1]

$ 1

675,905

(723,448)

Beginning balance, shares at Dec. 31, 2023

67,310,838

Exercise of stock options and release of RSUs

174

Exercise of stock options and release of RSUs, shares

826,797

Stock-based compensation

1,907

Other comprehensive income (loss)

(105)

Net Income (Loss)

13,791

Ending balance at Mar. 31, 2024

(31,680)

$ 1

677,986

(10)

(709,657)

Ending balance, shares at Mar. 31, 2024

68,137,635

Beginning balance at Dec. 31, 2023

$ (47,447)

^[1]

$ 1

675,905

(723,448)

Beginning balance, shares at Dec. 31, 2023

67,310,838

Exercise of stock options, shares

132,351

Other comprehensive income (loss)

$ (55)

Net Income (Loss)

12,993

Ending balance at Sep. 30, 2024

(23,452)

$ 1

686,962

(710,455)

Ending balance, shares at Sep. 30, 2024

78,232,601

Beginning balance at Mar. 31, 2024

(31,680)

$ 1

677,986

(10)

(709,657)

Beginning balance, shares at Mar. 31, 2024

68,137,635

Exercise of stock options and release of RSUs

Exercise of stock options and release of RSUs, shares

12,477

Issuance of common stock under the ESPP, shares

196,930

Issuance of common stock under the ESPP

236

Issuance of common stock under the Open Market Sale Agreement, net of issuance cost, shares

2,270,608

Issuance of common stock under the Open Market Sale Agreement, net of issuance cost

4,843

Exercise of pre-funded warrants, shares

7,499,951

Stock-based compensation

1,882

Other comprehensive income (loss)

Net Income (Loss)

(6,534)

Ending balance at Jun. 30, 2024

$ (31,227)

$ 1

684,967

(4)

(716,191)

Ending balance, shares at Jun. 30, 2024

78,117,601

Release of RSUs, shares

115,000

Stock-based compensation

$ 1,995

1,995

Other comprehensive income (loss)

Net Income (Loss)

5,736

Ending balance at Sep. 30, 2024

$ (23,452)

$ 1

$ 686,962

$ 40

$ (710,455)

Ending balance, shares at Sep. 30, 2024

78,232,601

[1]	The condensed balance sheet as of December 31, 2023 was derived from the audited financial statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2023.

License Agreement - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended			3 Months Ended		9 Months Ended
	Apr. 30, 2024	Mar. 31, 2024	Apr. 30, 2019	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Aug. 31, 2010
License Agreement [Line Items]
Annual minimum royalty obligations								$ 0.2
Astellas Pharma Inc. \| Collaboration and License Agreement
License Agreement [Line Items]
Sublicense fees		$ 0.6
Immuno Gen Inc
License Agreement [Line Items]
Milestone payment	$ 5.0
UCSB
License Agreement [Line Items]
Payment of upfront fees			$ 1.0
Annual license maintenance fees			$ 0.8
License payment term			2031
Sublicense fees				$ 0.0	$ 0.0	$ 1.6	$ 1.1

Collaboration and License Agreements - Amgen, Inc - Additional Information (Details) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended	9 Months Ended
	Sep. 29, 2017 USD ($) Target	Oct. 31, 2017 USD ($) $ / shares shares	Sep. 30, 2024 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Common stock, value of shares issued in connection with agreement				$ 4,843	$ 0
Deferred revenue			$ 129,619	129,619	$ 236,657	$ 212,315	$ 301,326
Amgen Inc \| EGFR Products
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Deferred revenue			11,300	11,300
Collaboration and License Agreement \| Amgen Inc
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Upfront payment received		$ 40,000
Common stock, shares issuable under agreement \| shares		1,156,069
Common stock, shares issuable under agreement, price per share \| $ / shares		$ 17.3
Common stock, value of shares issued in connection with agreement		$ 20,000
Number of targets selected \| Target	1
Number of additional collaboration target \| Target	2
Collaboration and License Agreement \| Amgen Inc \| Maximum
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Contingent payments payable	$ 203,000
Collaboration and License Agreement \| Amgen Inc \| EGFR Products
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Deferred revenue			11,300	$ 11,300		$ 12,800
Cumulative adjustment to revenue			$ (800)
Collaboration and License Agreement \| Amgen Inc \| EGFR Products \| Maximum
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Contingent milestone payments receivable	$ 460,000
Percentage share of profit and losses	50.00%
Collaboration and License Agreement \| Amgen Inc \| Amgen Products \| Maximum
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Contingent milestone payments receivable	$ 950,000
Number of targets \| Target	3

Collaboration and License Agreements - Summary of Contract Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Revenue from Contract with Customer [Abstract]
Beginning Balance	$ 212,315	$ 301,326
Additions	6,652	3,921
Revenue recognized	(89,348)	(68,590)
Ending Balance	$ 129,619	$ 236,657

Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2024	Oct. 31, 2024
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2024
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q3
Trading Symbol	CTMX
Entity Registrant Name	CytomX Therapeutics, Inc.
Entity Central Index Key	0001501989
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity File Number	001-37587
Entity Tax Identification Number	27-3521219
Entity Address, Address Line One	151 Oyster Point Blvd.
Entity Address, Address Line Two	Suite 400
Entity Address, City or Town	South San Francisco
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94080
City Area Code	650
Local Phone Number	515-3185
Entity Interactive Data Current	Yes
Title of 12(b) Security	Common Stock, $0.00001 par value per share
Security Exchange Name	NASDAQ
Entity Incorporation, State or Country Code	DE
Document Quarterly Report	true
Document Transition Report	false
Entity Common Stock, Shares Outstanding		78,258,879

Net Income (Loss) Per Share (Tables)

9 Months Ended

Sep. 30, 2024

Earnings Per Share [Abstract]

Summary of Calculation of Basic and Diluted Net Income (Loss) Per Share

The following table presents the calculation of basic and diluted net income (loss) per share:


	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2024		2023		2024		2023
	(in thousands, except share and per share data)
Numerator:
Net income (loss)	$	5,736	$	2,992	$	12,993	$	(1,406	)

Denominator:
Basic
Weighted-average common shares outstanding		78,170,101		66,779,192		77,081,967		66,523,404
Weighted-average pre-funded warrants		6,923,126		13,952,759		6,923,126		4,702,029
Weighted-average common shares outstanding used to calculate basic net income (loss) per share		85,093,227		80,731,951		84,005,093		71,225,433
Diluted
Weighted-average common shares outstanding used to calculate basic net income (loss) per share		85,093,227		80,731,951		84,005,093		71,225,433
Effect of potentially dilutive securities:
Stock options, ESPP & RSUs		111,482		259,771		423,750		—
Weighted-average common shares outstanding used to calculate diluted net income (loss) per share		85,204,709		80,991,722		84,428,843		71,225,433

Net income (loss) per share
Basic	$	0.07	$	0.04	$	0.15	$	(0.02	)
Diluted	$	0.07	$	0.04	$	0.15	$	(0.02	)

Summary of Potentially Dilutive Securities Excluded from Computation of Diluted Net Income (Loss) Per Share

The following weighted-average outstanding shares of potentially dilutive securities are excluded from the computation of diluted net income (loss) per share for the periods presented, because including them would have been anti-dilutive:


	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2024		2023		2024		2023

Options and ESPP to purchase common stock		14,583,619		13,863,671		14,262,791		14,046,593
Common stock warrants		11,538,462		11,162,208		11,538,462		3,720,736
RSUs		1,738,213		884,232		217,727		1,659,636
Total		27,860,294		25,910,111		26,018,980		19,426,965

Commitments and Contingencies

9 Months Ended

Sep. 30, 2024

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

9. Commitments and Contingencies

Legal Proceedings

On March 4, 2020, Vytacera Bio, LLC (“Vytacera”) filed a patent infringement lawsuit against the Company in the U.S. District Court for the District of Delaware. The lawsuit alleged that the Company's use, offers to sell, and/or sales of the PROBODY® technology platform for

basic research applications constituted infringement. The complaint sought unspecified monetary damages. In September 2022, the Company filed a motion to dismiss the case. On October 17, 2024, the Court dismissed the case. Vytacera may appeal. The Company believes that the lawsuit is without merit and intends to vigorously defend itself through any appeal. The Company does not believe a loss is probable and has not recorded any amount as a contingent liability for claims associated with this lawsuit as of September 30, 2024.

Collaboration and License Agreements (Tables)

9 Months Ended

Sep. 30, 2024

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Revenue by Collaboration Partners

The following table summarizes the revenue by collaboration partner:


	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2024			2023		2024		2023
	(in thousands)					(in thousands)
AbbVie	$	—		$	—	$	—	$	3,988
Amgen		(783	)		1,627		1,491		5,124
Astellas		2,553			4,630		23,497		18,685
Bristol Myers Squibb		22,977			14,028		56,042		35,630
Regeneron		2,896			2,913		7,925		5,249
Moderna		5,789			3,186		11,055		5,931
Total revenue	$	33,432		$	26,384	$	100,010	$	74,607

Summary of Contract Liabilities

The following table presents changes in the Company’s total contract liabilities during the nine months ended September 30, 2024 and 2023:


	Deferred Revenue
	(in thousands)
December 31, 2023	$	212,315
Additions		6,652
Revenue recognized		(89,348	)
September 30, 2024	$	129,619

December 31, 2022	$	301,326
Additions		3,921
Revenue recognized		(68,590	)
September 30, 2023	$	236,657

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Sep. 30, 2024 shares
Trading Arrangements, by Individual
Material Terms of Trading Arrangement	Rule 10b5-1 Trading Arrangements 10b5-1 plan: On August 27, 2024, Sean McCarthy, CEO, adopted a Rule 10b5-1 trading arrangement that is intended to satisfy the affirmative defense of Rule 10b5-1(c) for the sale of up to 200,000 shares of the Company’s common stock until December 31, 2025.
Sean McCarthy [Member]
Trading Arrangements, by Individual
Name	Sean McCarthy
Title	CEO
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	August 27, 2024
Expiration Date	December 31, 2025
Arrangement Duration	491 days
Aggregate Available	200,000

Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended			3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 31, 2024	Feb. 28, 2023	Aug. 31, 2022	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022
Time based RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense				$ 400	$ 500	$ 1,100	$ 1,500
Granted						1,195,833
Performance based RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense									$ 55,000
Granted		760,000	250,000			810,000
PSU's Awarded, Grant date fair value		$ 1,900	$ 400
2024 Performance based RSU
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted	810,000
PSU's Awarded, Grant date fair value	$ 1,300
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense				1,500	$ 500	$ 4,400	$ 4,100
Share Based Compensation Award Tranche Two \| Performance based RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting rights, description		Vesting for 50% of the PSUs granted will occur upon attaining certain specific milestones by December 2024 (“2023-Tranche 1”), and the remaining 50% will vest upon attaining certain specific milestones by December 2025 (“2023-Tranche 2”).	Vesting for 50% of the PSUs granted was set to occur upon attaining certain specific milestones by December 2023 (“2022-Tranche 1”), and the remaining 50% are set to vest upon attaining certain specific milestones by December 2024 (“2022-Tranche 2”).
Share Based Compensation Award Tranche Two \| 2024 Performance based RSU
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting rights, description	Vesting for 50% of the PSUs granted will occur upon attaining certain specific milestones by December 2025 (“2024-Tranche 1”), and the remaining 50% will vest upon attaining certain specific milestones by December 2026 (“2024-Tranche 2”).
Tranche One \| Performance based RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense								$ 128,000
Tranche Two \| Performance based RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense				$ 38,000		$ 77,000		$ 106,000

Collaboration and License Agreements - Regeneron Pharmaceuticals, Inc - Additional Information (Details) - USD ($) $ in Thousands	Nov. 16, 2022	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Deferred revenue		$ 129,619	$ 212,315	$ 236,657	$ 301,326
Regeneron Pharmaceuticals, Inc
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Deferred revenue		18,000
Collaborative Arrangement \| Regeneron Pharmaceuticals, Inc
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Upfront payment received	$ 30,000
Collaboration and License Agreement \| Regeneron Pharmaceuticals, Inc
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Deferred revenue		18,000	24,400
Amount due from customer		$ 1,000	$ 1,100
Collaboration and License Agreement \| Regeneron Pharmaceuticals, Inc \| Maximum
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Contingent milestone payments receivable	800,000
Collaboration and License Agreement \| Regeneron Pharmaceuticals, Inc \| Maximum \| Additional Contingent Payments
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Contingent milestone payments receivable	$ 1,200,000

Collaboration and License Agreements - Astellas Pharma Inc - Additional Information (Details) $ in Thousands		1 Months Ended	3 Months Ended
	Mar. 23, 2020 USD ($) Target	Jan. 31, 2023 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Deferred revenue					$ 129,619	$ 212,315	$ 236,657	$ 301,326
Astellas Pharma Inc.
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Deferred revenue					22,200
Collaboration and License Agreement \| Astellas Pharma Inc.
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Number of targets selected \| Target	1
Number of additional collaboration target \| Target	3
Upfront payment received	$ 80,000
Milestone payments received		$ 5,000	$ 5,000	$ 5,000
Additional milestone payment received			$ 5,000
Deferred revenue					22,200	31,000
Amount due from customer					$ 1,100	$ 2,200
Collaboration and License Agreement \| Astellas Pharma Inc. \| Maximum
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Number of targets \| Target	4
Right to expand the number of additional collaboration target \| Target	5
Contingent milestone payments receivable	$ 1,600,000
Collaboration and License Agreement \| Astellas Pharma Inc. \| Minimum
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Right to expand the number of additional collaboration target \| Target	3

CONDENSED BALANCE SHEETS - USD ($)
$ in Thousands

Sep. 30, 2024

Dec. 31, 2023

Current assets:

Cash and cash equivalents

$ 40,576

$ 17,171

^[1]

Short-term investments

77,012

157,338

^[1]

Accounts receivable

3,352

3,432

^[1]

Prepaid expenses and other current assets

3,240

4,995

^[1]

Total current assets

124,180

182,936

^[1]

Property and equipment, net

2,942

3,958

^[1]

Intangible assets, net

620

729

^[1]

Goodwill

949

^[1]

Restricted cash

1,027

917

^[1]

Operating lease right-of-use asset

9,193

12,220

^[1]

Other assets

^[1]

Total assets

138,981

201,792

^[1]

Current liabilities:

Accounts payable

1,422

1,458

^[1]

Accrued liabilities

16,742

17,599

^[1]

Operating lease liabilities - short term

5,001

4,589

^[1]

Deferred revenue, current portion

96,063

132,267

^[1]

Total current liabilities

119,228

155,913

^[1]

Deferred revenue, net of current portion

33,556

80,048

^[1]

Operating lease liabilities - long term

5,596

9,385

^[1]

Other long term liabilities

4,053

3,893

^[1]

Total liabilities

162,433

249,239

^[1]

Commitments and contingencies (Note 9)

Stockholders' deficit:

Convertible preferred stock

^[1]

Common stock

^[1]

Additional paid-in capital

686,962

675,905

^[1]

Accumulated other comprehensive income

^[1]

Accumulated deficit

(710,455)

(723,448)

^[1]

Total stockholders' deficit

(23,452)

(47,447)

^[1]

Total liabilities and stockholders' deficit

$ 138,981

$ 201,792

^[1]

[1]	The condensed balance sheet as of December 31, 2023 was derived from the audited financial statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2023.

Stock-Based Compensation - Schedule of Activities for Company's PSUs (Details) - Performance based RSUs - $ / shares	1 Months Ended		9 Months Ended
	Feb. 28, 2023	Aug. 31, 2022	Sep. 30, 2024
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Balance at December 31, 2023			875,000
Units awarded	760,000	250,000	810,000
Unit released			(115,000)
Balance at September 30, 2024			1,570,000
Balance at December 31, 2023			$ 2.41
Units Awarded			1.66
Unit released			1.59
Balance at September 30, 2024			$ 2.09

- 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.

+ References

+ Details

Collaboration and License Agreements - Contract Liabilities - Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Deferred revenue	$ 129,619	$ 212,315	$ 236,657	$ 301,326
Amgen Inc \| EGFR Products
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Deferred revenue	$ 11,300
Deferred Revenue Recognition Maturity Year	2027
Astellas Pharma Inc.
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Deferred revenue	$ 22,200
Deferred Revenue Recognition Maturity Year	2026
Bristol Myers Squibb
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Deferred revenue	$ 63,900
Deferred Revenue Recognition Maturity Year	2025
ModernaTX, Inc
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Deferred revenue	$ 14,200
Deferred Revenue Recognition Maturity Year	2027
Regeneron Pharmaceuticals, Inc
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Deferred revenue	$ 18,000
Deferred Revenue Recognition Maturity Year	2026

Commitments and Contingencies - Additional Information (Details) - Patent Infringement Lawsuit - USD ($)		9 Months Ended
	Mar. 04, 2020	Sep. 30, 2024
Loss Contingencies [Line Items]
Lawsuit filed date	Mar. 04, 2020
Name of plaintiff		Vytacera Bio, LLC
Loss contingency claim amount		$ 0

- 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.

+ References + Details

Collaboration and License Agreements

9 Months Ended

Sep. 30, 2024

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Collaboration and License Agreements

6. Collaboration and License Agreements

The following table summarizes the revenue by collaboration partner:


	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2024			2023		2024		2023
	(in thousands)					(in thousands)
AbbVie	$	—		$	—	$	—	$	3,988
Amgen		(783	)		1,627		1,491		5,124
Astellas		2,553			4,630		23,497		18,685
Bristol Myers Squibb		22,977			14,028		56,042		35,630
Regeneron		2,896			2,913		7,925		5,249
Moderna		5,789			3,186		11,055		5,931
Total revenue	$	33,432		$	26,384	$	100,010	$	74,607

AbbVie Ireland Unlimited Company

In April 2016, the Company and AbbVie entered into two agreements, a CD71 Co-Development and Licensing Agreement (the “CD71 Agreement”) and a Discovery Collaboration and Licensing Agreement (as amended and restated in June 2019, the “Discovery Agreement” and together with the CD71 Agreement the “AbbVie Agreements”). Under the terms of the CD71 Agreement, the Company and AbbVie were co-developing a conditionally activated antibody-drug conjugate (“ADC”), CX-2029, against CD71, with the Company being responsible for preclinical and early clinical development. AbbVie was to be responsible for later development and commercialization, with global late-stage development costs shared between the two companies. Under the CD71 Agreement, the Company has received in aggregate $100.0 million in upfront and milestone payments. AbbVie had entered into a license agreement with Seattle Genetics, Inc. (“SGEN”) to license certain intellectual property rights pursuant to which the Company was required to pay SGEN sublicense fees for certain milestone achievements and an annual maintenance fee. These sublicense fees were treated as reductions to the transaction price and combined with the performance obligation to which they relate.

In March 2023, the Company announced that it would evaluate the potential next steps for CX-2029 following the decision from AbbVie, to not advance CX-2029 into additional clinical studies. As a result of AbbVie’s decision, the 2016 CD71 License and Collaboration Agreement was terminated in May 2023 and the Company re-acquired full rights to CX-2029. The Company has completed the performance obligation under the CD71 Agreement as of March 31, 2023, and recognized the related remaining deferred revenue of $4.0 million in the first quarter of 2023.

In December 2022, the research on the two discovery targets under the Discovery Agreement concluded with no plans to advance the discovery targets into clinical studies or to pursue new programs. The Discovery Agreement was also terminated and all target rights have reverted back to CytomX.

In August 2023, the Company entered into a Transition Agreement (the “Transition Agreement”) with AbbVie Global Enterprises Ltd. ("AbbVie Global", an affiliate entity of AbbVie), pursuant to which the Company regained exclusive worldwide rights to develop CX-2029, a CD71-targeting conditionally activated antibody drug conjugate. The Transition Agreement supersedes the CD71 Agreement that was terminated in May 2023, and grants certain intellectual property rights from AbbVie Global to enable the continued development of CX-2029 by the Company for all human and nonhuman diagnostic, prophylactic, and therapeutic uses. Pursuant to the Transition Agreement, AbbVie

Global is eligible to receive tiered sales royalties for CX-2029 ranging from the low-to-mid single digit percentages. In the fourth quarter of 2023, the Company decided to not to make any further substantial investments in the CX-2029 program in the near-term but continues to view CD71 as a target of strategic interest, including novel next-generation strategies.

Amgen, Inc.

On September 29, 2017, the Company and Amgen, Inc. (“Amgen”) entered into a Collaboration and License Agreement (the “Amgen Agreement”). Pursuant to the Amgen Agreement, the Company received an upfront payment of $40.0 million in October 2017. Concurrent with the Amgen Agreement, the Company and Amgen entered into a Share Purchase Agreement pursuant to which Amgen purchased 1,156,069 shares of the Company’s common stock at a price of $17.30 per share for total proceeds of $20.0 million.

In October 2021, CytomX and Amgen executed an amendment to the Amgen Agreement primarily to (1) extend the target selection date for Amgen to select its additional targets for research and development, and (2) reduce the total number of milestone events and increase the total amount of milestone payments for EGFR Products. In each of May 2023 and March 2024, CytomX and Amgen executed an amendment to the Amgen Agreement to extend the target selection period for Amgen to select its additional targets for research and development as further discussed below.

Under the terms of the Amgen Agreement, as amended, the Company and Amgen will co-develop a conditionally activated T-cell engager (“TCE”) targeting epidermal growth factor receptor (the “EGFR Products”). The Company is responsible for early-stage development of EGFR Products and Amgen will be responsible for late-stage development and commercialization of EGFR Products. Following early-stage development, the Company will have the right to elect to participate financially in the global co-development of EGFR Products with Amgen, during which the Company would bear a certain percentage of the worldwide development costs for EGFR Products and Amgen would bear the rest of such costs (the “EGFR Co-Development Option”). If the Company exercises its EGFR Co-Development Option, the Company will share in somewhat less than 50% of the profit and losses from sales of such EGFR Products in the U.S., subject to certain caps, offsets, and deferrals. If the Company chooses not to exercise its EGFR Co-Development Option, the Company will not bear any costs of later stage development. The Company is also eligible to receive up to $460.0 million in development, regulatory, and commercial milestone payments for EGFR Products, and royalties in the low-double-digit to mid-teen percentage of worldwide commercial sales, provided that if the Company exercises its EGFR Co-Development option, it shall receive a profit and loss split of sales in the United States and royalties in the low-double-digit to mid-teen percentage of commercial sales outside of the United States. In January 2022, the IND for the EGFR product (CX-904) was allowed to proceed by the U.S. Food and Drug Administration (“FDA”) and the program continues in an ongoing Phase 1 study.

Amgen also has the right to select a total of up to three targets, including the two additional targets discussed below. The Company and Amgen collaborate in the research and development of conditionally activated T-cell engaging bispecifics therapies directed against such targets. Amgen has selected one such target (the “Amgen Other Product”). If Amgen exercises its option within a specified period of time, it can select two such additional targets (the “Amgen Option Products” and, together with the Amgen Other Product, the “Amgen Products”). Except with respect to preclinical activities to be conducted by CytomX, Amgen will be responsible, at its expense, for the development, manufacture, and commercialization of all Amgen Products. If Amgen exercises all of its options and advances all three of the Amgen Products, CytomX is eligible to receive up to $950.0 million in upfront, development, regulatory, and commercial milestones and tiered high single-digit to low-teen percentage royalties. The Company concluded that, at the inception of the agreement and subsequent amendments, Amgen’s option to select the two additional targets is not a material right and does not represent a performance obligation of the agreement.

At the initiation of the collaboration, CytomX had the option to select from programs specified in the Amgen Agreement, an existing preclinical stage TCE product from the Amgen preclinical pipeline. In March 2018, CytomX selected the program and this program is currently in preclinical development. CytomX is responsible, at its expense, for converting this program to a conditionally activated TCE product, and thereafter, will be responsible for development, manufacturing, and commercialization of the product (“CytomX Product”). Amgen is eligible to receive up to $203.0 million in development, regulatory, and commercial milestone payments for the CytomX Product, and tiered mid-single digit to low double-digit percentage royalties.

As of September 30, 2024 and December 31, 2023, deferred revenue related to the EGFR Products performance obligation was $11.3 million and $12.8 million, respectively. Revenue is recognized over the estimated research period using an input measure based on our actual full-time employee ("FTE") hours incurred as a percentage of projected FTE hours for completing the performance obligation. We evaluate the measure of progress each reporting period and, if necessary, we adjust the measure of performance and related revenue recognition. In the three months ended September 30, 2024, we revised the estimated FTE hours-to-completion for the EGFR Products performance obligation which resulted in a cumulative adjustment to revenue which was a $0.8 million reduction of revenue in the period. Such adjustments have

impacted and will continue to impact the amounts and timing of our revenue recognized. Deferred revenue related to the Amgen Other Products performance obligation was immaterial as of September 30, 2024 and December 31, 2023.

Astellas Pharma Inc.

The Company and Astellas Pharma, Inc. (“Astellas”) entered into a Collaboration and License Agreement (the “Astellas Agreement”) on March 23, 2020, the effective date, to collaborate on preclinical research activities to discover and develop certain antibody compounds for the treatment of cancer using the Company’s PROBODY therapeutic technology.

Under the terms of the Astellas Agreement, the Company granted Astellas an exclusive, worldwide right to develop and commercialize PROBODY therapeutics for up to four collaboration targets including one initial target and three additional targets (“Additional Targets”). In addition, Astellas had the right to expand the number of Additional Targets from three up to five (the “Expansion Option”) before the third anniversary of the effective date. Furthermore, for a specified number of targets, at a pre-specified time prior to the initiation of the first pivotal study of a product against such target, the Company may elect to participate in certain development costs and share in the profits generated in the United States with respect to such product (“Cost Share Option”). The Cost Share Option, if exercised, will also provide the option for the Company to co-commercialize such product in the United States. The Company does not consider the Cost Share Option as a performance obligation at the inception of the agreement as participation is at the Company’s discretion.

Pursuant to the Astellas Agreement, the consideration from Astellas is comprised of an upfront fee of $80.0 million and contingent payments for development, regulatory and sales milestones of up to an aggregate of approximately $1.6 billion. The Company is also entitled to tiered royalties from high-single digit to mid-teen percentage royalties from potential future sales. Astellas is responsible for all preclinical research costs incurred by either party as set forth in the preclinical research plan and the Company will receive research and development service fees based on a prescribed full-time employee ("FTE") rate.

In January 2023, the Company announced that it achieved a clinical candidate milestone under the Astellas Agreement which triggered a $5.0 million milestone payment to the Company. The $5.0 million milestone payment was fully recognized in the first quarter of 2023 as the Company had completed its related performance obligation of the collaboration target which resulted in the clinical candidate nomination for further development. In March 2024, the Company announced that it achieved the good laboratory practices ("GLPs") toxicology milestone for this candidate which triggered a $5.0 million milestone payment to the Company. The $5.0 million milestone payment was fully recognized in the first quarter of 2024 as the Company had completed its related performance obligation of the collaboration target. Also, in March 2024, the Company announced that it achieved a clinical candidate milestone for a second collaboration target under the Astellas Agreement which triggered an additional $5.0 million milestone payment to the Company. The $5.0 million milestone payment was fully recognized in the first quarter of 2024 as the Company had completed its related performance obligation of the collaboration target which resulted in the clinical candidate nomination for further development.

As of September 30, 2024 and December 31, 2023, deferred revenue relating to the Astellas Agreement was $22.2 million and $31.0 million, respectively. The amount due from Astellas under the Astellas Agreement was $1.1 million as of September 30, 2024 and $2.2 million as of December 31, 2023.

Bristol Myers Squibb Company

On May 23, 2014, the Company and Bristol Myers Squibb Company (“Bristol Myers Squibb”) entered into a Collaboration and License Agreement (the “BMS Agreement”) to discover and develop compounds for use in human therapeutics aimed at multiple immuno-oncology targets using the Company’s PROBODY therapeutic technology, including the target CTLA-4. The effective date of the BMS Agreement was July 7, 2014.

Under the terms of the BMS Agreement, the Company granted Bristol Myers Squibb exclusive worldwide rights to develop and commercialize PROBODY therapeutics for up to four oncology targets. Bristol Myers Squibb had additional rights to substitute up to two collaboration targets within three years of the effective date of the BMS Agreement. These rights expired in May 2017. Each collaboration target had a two-year research term and the two additional targets had to be nominated by Bristol Myers Squibb within five years of the effective date of the BMS Agreement. The research term for each collaboration target could be extended in one year increments up to three times.

Pursuant to the BMS Agreement, the financial consideration from Bristol Myers Squibb was comprised of an upfront payment of $50.0 million and estimated research and development service fees, and the Company was initially entitled to receive contingent payments of up to

$25.0 million for additional targets and contingent payments for development, regulatory and sales milestones. In addition, the Company was entitled to royalty payments in the mid-single digits to low double-digit percentages from potential future sales.

On March 17, 2017, the Company and Bristol Myers Squibb amended the BMS agreement and entered into Amendment Number 1 to Extend Collaboration and License Agreement (“Amendment 1”). Amendment 1 granted Bristol Myers Squibb exclusive worldwide rights to develop and commercialize PROBODY therapeutics for up to eight additional targets. The effective date of Amendment 1 was April 25, 2017 (“Amendment Effective Date”). Under the terms of Amendment 1, the Company continued to have obligations to Bristol Myers Squibb to discover and conduct preclinical development of PROBODY therapeutics against any targets they chose to select during the research period under the terms of Amendment 1.

Pursuant to Amendment 1, the financial consideration from Bristol Myers Squibb was comprised of an upfront payment of $200.0 million, estimated research and development service fees, and contingent payments for development, regulatory and sales milestones for the eight targets. The Company was also entitled to tiered mid-single to low double-digit percentage royalties from potential future sales. Amendment 1 did not change the term of Bristol Myers Squibb’s royalty obligation under the BMS Agreement. Bristol Myers Squibb’s royalty obligation continues on a licensed-product by licensed-product basis until the later of (i) the expiration of the last claim of the licensed patents covering the licensed products in the country, (ii) the twelfth anniversary of the first commercial sale of a licensed product in a country, or (iii) the expiration of any applicable regulatory, pediatric, orphan drug or data exclusivity with respect to such product.

The initial transaction price for the BMS Agreement and Amendment 1, collectively, was $304.7 million consisting of the upfront fees of $250.0 million, target selection fees for the third and fourth targets of $25.0 million, estimated research and development service fees of $17.7 million and milestone payments received up to January 1, 2018, of $12.0 million. The Company determined that the remaining potential milestone payments were probable of significant revenue reversal as their achievement was highly dependent on factors outside the Company’s control. Therefore, these payments were fully constrained and were not included in the transaction price upon the adoption of ASC 606 on January 1, 2018. The initial transaction price for the combined obligation for each collaboration target is recognized using an input measure.

In February 2021, the Company and Bristol Myers Squibb amended the BMS agreement and entered into Amendment Number 2 to amend the Collaboration and License Agreement (“Amendment 2”), as previously amended by Amendment 1. Subsequent to Amendment 2, in addition to Bristol Myers Squibb’s ongoing development of the CTLA-4 program, Bristol Myers Squibb also had the exclusive worldwide rights to develop and commercialize PROBODY therapeutics for up to five oncology targets. Under the terms of Amendment 2, the period for target selection was extended and in 2022, all remaining targets were selected. The Company will continue to collaborate with Bristol Myers Squibb to discover and conduct preclinical development of PROBODY therapeutics against targets selected by Bristol Myers Squibb over the estimated research period, which is projected to end in April 2025. Pursuant to Amendment 2, the Company was eligible to receive contingent payments for development, regulatory and sales milestones. It is also entitled to tiered mid-single to low double-digit percentage of royalties from potential future sales. The Company accounted for Amendment 2 as a modification and reallocated the remaining unrecognized transaction price to the remaining performance obligations.

In October 2022, the Company and Bristol Myers Squibb amended the BMS Agreement and entered into Amendment Number 3 (“Amendment 3”), as previously amended by Amendment 1 and Amendment 2, to clarify the rights and restrictions of certain new proprietary antibodies that the parties exchanged. There were no substantive changes to each party's performance obligations.

In March 2024, following a Bristol Myers Squibb corporate portfolio prioritization process, Bristol Myers Squibb notified CytomX that it does not intend to continue the development of BMS-986288 beyond the current Phase 2 study and terminated its collaboration license on the CTLA-4 target under the collaboration. BMS-986288 was Bristol Myers Squibb’s leading next generation PROBODY CTLA-4 program that it had previously prioritized over BMS-986249, which was a PROBODY version of ipilumamab.

In June 2024, Bristol Myers Squibb prioritized its pre-clinical research activities under the collaboration and revised the research scope by one collaboration target. The Company determined that it has no further obligations related to the target that was deprioritized and accounted for the reduction of the target as a modification and the related remaining unrecognized transaction price was reallocated to the remaining performance obligations. The Company continues to be obligated to perform research work under Amendment 2 executed in February 2021 for multiple ongoing research programs.

As of September 30, 2024, the Company is eligible to receive approximately $1.3 billion in contingent payments for development, regulatory and sales milestones for the ongoing collaboration programs.

The Company reevaluated the remaining potential milestone payments and determined that significant revenue reversal was probable as the achievement of such milestones was highly dependent on factors outside the Company’s control. As a result, these payments continued to be fully constrained and were not included in the transaction price as of September 30, 2024.

As of September 30, 2024 and December 31, 2023, deferred revenue relating to the BMS Agreement was $63.9 million and $119.9 million, respectively.

ModernaTX, Inc.

The Company and ModernaTX, Inc. (“Moderna”) entered into a Collaboration and License Agreement (the “Moderna Agreement”) on December 30, 2022, the effective date, to collaborate on discovery and preclinical research and development activities to create investigational messenger RNA (mRNA) based conditionally activated therapies using the Company’s PROBODY therapeutic technology. Moderna is solely responsible for the development (preclinical and clinical), manufacturing, and commercialization of any products under the Moderna Agreement.

Under the terms of the Moderna Agreement, the Company granted Moderna an exclusive, worldwide right to develop and commercialize PROBODY therapeutics for the collaboration programs. In exchange, the Company received an upfront payment of $35.0 million in January 2023, including $5.0 million of prepaid research and development service fees. The Company will continue to receive research and development service fees according to the preclinical research work plans based on a prescribed FTE rate and is eligible to receive up to approximately $1.2 billion in future development, regulatory, and commercial milestone payments. The Company is also eligible to receive tiered royalties from high-single digit to low-teen percentage rates of annual global net sales of any products that are commercialized under the Moderna Agreement.

As of September 30, 2024 and December 31, 2023, deferred revenue relating to the Moderna Agreement was $14.2 million and $24.2 million, respectively. The amount due from Moderna under the Moderna Agreement was $1.1 million as of September 30, 2024 and $0 as of December 31, 2023.

Regeneron Pharmaceuticals, Inc.

The Company and Regeneron Pharmaceuticals Inc. (“Regeneron”) entered into a Collaboration and License Agreement (the “Regeneron Agreement”) on November 16, 2022, to collaborate on creation of conditionally-activated investigational bispecific cancer therapies utilizing the Company’s PROBODY® therapeutic platform and Regeneron’s Veloci-Bi® bispecific antibody development platform. The Company and Regeneron will collaborate on preclinical research and discovery activities for initially agreed upon collaboration programs (“Collaboration Program”) with an option to expand additional Collaboration Programs (“Additional Collaboration Program Option”).

Under the Collaboration and License Agreement, the Company granted Regeneron an exclusive, worldwide, royalty-bearing license under certain Company intellectual property to develop, manufacture, commercialize and otherwise exploit licensed products (“Licensed Products”) for all human and non-human diagnostic, prophylactic and therapeutic uses in oncology. Regeneron is responsible for funding the cost of preclinical research and discovery activities of both parties for all Licensed Products and for funding the cost of development, manufacturing and commercialization of all Licensed Products worldwide.

Pursuant to the Regeneron Agreement, the consideration from Regeneron is comprised of an upfront fee of $30.0 million, contingent payments for development and regulatory milestones and commercial milestone payments of up to an aggregate of approximately $0.8 billion. If Regeneron exercises its Additional Collaboration Program Option, the Company would be eligible to receive additional upfront and milestone payments aggregating up to approximately $1.2 billion. The Company is also entitled to tiered royalties from high-single digit to low-teen percentage royalties from potential future sales. In addition, the Company will receive research and development service fees based on a prescribed FTE rate.

As of September 30, 2024 and December 31, 2023, deferred revenue relating to the Regeneron Agreement was $18.0 million and $24.4 million, respectively. The amount due from Regeneron under the Regeneron Agreement was $1.0 million and $1.1 million as of September 30, 2024 and December 31, 2023, respectively.

Contract Liabilities

The following table presents changes in the Company’s total contract liabilities during the nine months ended September 30, 2024 and 2023:


	Deferred Revenue
	(in thousands)
December 31, 2023	$	212,315
Additions		6,652
Revenue recognized		(89,348	)
September 30, 2024	$	129,619

December 31, 2022	$	301,326
Additions		3,921
Revenue recognized		(68,590	)
September 30, 2023	$	236,657

The Company expects that the $129.6 million of deferred revenue related to the following contracts as of September 30, 2024 will be recognized as revenue based on actual FTE effort and estimated program progress as set forth below. However, the timing of revenue recognition could differ from the estimates depending on facts and circumstances impacting the various contracts, including progress of research and development, resources assigned to the contracts by the Company or its collaboration partners or other factors outside of the Company’s control.

•

The $11.3 million of deferred revenue related to the Amgen EGFR Products is expected to be recognized until 2027.

•

The $22.2 million of deferred revenue related to the Astellas Agreement is expected to be recognized until 2026.

•

The $63.9 million of deferred revenue related to the BMS Agreement is expected to be recognized through the second quarter of 2025.

•

The $14.2 million of deferred revenue related to the Moderna Agreement, together with research and development service fees, is expected to be recognized until 2027.

•

The $18.0 million of deferred revenue related to the Regeneron Agreement, together with research and development service fees, is expected to be recognized until 2026.

Net Income (Loss) Per Share - Summary of Calculation of Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Numerator:
Net Income (Loss)	$ 5,736	$ (6,534)	$ 13,791	$ 2,992	$ (1,087)	$ (3,311)	$ 12,993	$ (1,406)
Basic
Weighted-average common shares outstanding	78,170,101			66,779,192			77,081,967	66,523,404
Weighted-average pre-funded warrants	6,923,126			13,952,759			6,923,126	4,702,029
Weighted-average common shares outstanding used to calculate basic net income (loss) per share	85,093,227			80,731,951			84,005,093	71,225,433
Effect of potentially dilutive securities:
Stock options, ESPP & RSUs	111,482			259,771			423,750
Weighted-average common shares outstanding used to calculate diluted net income (loss) per share	85,204,709			80,991,722			84,428,843	71,225,433
Net income (loss) per share
Basic	$ 0.07			$ 0.04			$ 0.15	$ (0.02)
Diluted	$ 0.07			$ 0.04			$ 0.15	$ (0.02)

Common Stock - Additional Information (Details) - USD ($)		1 Months Ended			9 Months Ended
	May 01, 2024	Apr. 30, 2024	Jul. 31, 2023	Feb. 29, 2020	Sep. 30, 2024	Sep. 30, 2023	May 31, 2024
Class of Stock [Line Items]
Proceeds from issuance of common stock, net of issuance costs					$ 4,843,000	$ 0
Pre Funded Warrant
Class of Stock [Line Items]
Exercise price of warrants					$ 0.00001
Tranche one Warrant
Class of Stock [Line Items]
Exercise price of warrants					4.16
Tranche Two Warrant
Class of Stock [Line Items]
Exercise price of warrants					$ 6.24
Maximum
Class of Stock [Line Items]
Common stock shares authorized							300,000,000
Minimum
Class of Stock [Line Items]
Common stock shares authorized							150,000,000
Jefferies LLC
Class of Stock [Line Items]
Common stock, par value				$ 0.00001
Percentage of sales commission				3.00%
Issuance of common stock in follow-on offering, net of issuance costs, shares		2,270,608
Average price		$ 2.2
Proceeds from issuance of common stock, net of issuance costs		$ 4,800,000
Percentage of sales commission and issuance cost		3.00%
Jefferies LLC \| Maximum
Class of Stock [Line Items]
Proceeds from issuance of common stock, net of issuance costs				$ 75,000,000
BVF Partners
Class of Stock [Line Items]
Stock exercised	7,500,000
Exercise price of warrants	$ 0.00001
BVF Partners \| Private Placement
Class of Stock [Line Items]
Gross proceeds from issuance of private placement			$ 29,700,000
Issuance cost			$ 300,000
Price per share			$ 2.08
BVF Partners \| Private Placement \| Pre Funded Warrant
Class of Stock [Line Items]
Number of shares issued upon warrants			14,423,077
BVF Partners \| Private Placement \| Tranche one Warrant
Class of Stock [Line Items]
Number of shares issued upon warrants			5,769,231
BVF Partners \| Private Placement \| Tranche Two Warrant
Class of Stock [Line Items]
Number of shares issued upon warrants			5,769,231

Common Stock - Summary of Company's warrants (Details)	Sep. 30, 2024 $ / shares shares
Pre Funded Warrant
Class of Warrant or Right [Line Items]
Number of Warrants Outstanding \| shares	6,923,077
Weighted-Average Exercise Price Per Share \| $ / shares	$ 0.00001
Tranche one Warrant
Class of Warrant or Right [Line Items]
Number of Warrants Outstanding \| shares	5,769,231
Weighted-Average Exercise Price Per Share \| $ / shares	$ 4.16
Tranche Two Warrant
Class of Warrant or Right [Line Items]
Number of Warrants Outstanding \| shares	5,769,231
Weighted-Average Exercise Price Per Share \| $ / shares	$ 6.24

Description of the Business

9 Months Ended

Sep. 30, 2024

Disclosure Text Block [Abstract]

Description of the Business

1. Description of the Business

CytomX Therapeutics, Inc. (the “Company”) is a clinical-stage, oncology-focused biopharmaceutical company developing potent biologics designed to remain masked and inactive in healthy tissue and to be unmasked and preferentially activated in the tumor microenvironment. The Company aims to build a commercial enterprise to maximize its impact on the treatment of cancer. The Company is advancing potential first-in-class and best-in-class therapeutics created using its PROBODY® therapeutic technology platform that could meaningfully improve outcomes for cancer patients. Its proprietary and unique PROBODY technology platform is designed to enable “conditional activation” of masked antibody-based drugs in the tumor microenvironment across multiple therapeutic modalities. The Company is located in South San Francisco, California and was incorporated in the state of Delaware in September 2010.

Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2024

Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]

Schedule of Activities Under Company's Stock Option Plans

Activities for the Company’s stock option plans for the nine months ended September 30, 2024 were as follows:


	Options Outstanding
	Number of Options			Weighted- Average Exercise Price Per Share
Balance at December 31, 2023		12,949,612		$	7.16
Options granted		2,371,000			1.70
Options exercised		(132,351	)		1.58
Option forfeited/expired		(618,940	)		10.20
Balance at September 30, 2024		14,569,321		$	6.19

Total Stock-based Compensation Recognized

Total stock-based compensation recorded was as follows:


	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2024		2023		2024		2023
	(in thousands)				(in thousands)
Research and development	$	691	$	126	$	2,054	$	2,001
General and administrative		1,304		1,100		3,730		4,005
Total stock-based compensation expense	$	1,995	$	1,226	$	5,784	$	6,006

Time based RSUs

Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]

Schedule of Company's TRSU Activities

Activities for the Company’s TRSUs for the nine months ended September 30, 2024 were as follows:


	Number of Shares			Weighted Average Grant Date Fair Value Per Share

Balance at December 31, 2023		1,400,529		$	2.40
RSU's awarded		1,195,833			1.64
RSU's vested		(706,923	)		2.14
RSU's cancelled		(73,929	)		1.82
Balance at September 30, 2024		1,815,510		$	2.02

Performance based RSUs

Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]

Schedule of Activities for Company's PSUs

Activities for the Company’s PSUs for the nine months ended September 30, 2024, were as follows:


	Number of Shares			Weighted Average Grant Date Fair Value Per Share

Balance at December 31, 2023		875,000		$	2.41
PSU's awarded		810,000			1.66
PSU's released		(115,000	)		1.59
Balance at September 30, 2024		1,570,000		$	2.09

- 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.

+ References

+ Details

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2024
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying interim condensed financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and applicable rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) regarding interim financial reporting.
Unaudited Interim Financial Information	Unaudited Interim Financial Information The accompanying interim condensed financial statements and related disclosures are unaudited, have been prepared on the same basis as the annual financial statements and, in the opinion of management, reflect all adjustments, which include only normal recurring adjustments, necessary for a fair statement of the results of operations for the periods presented. The condensed results of operations for the three and nine months ended September 30, 2024 are not necessarily indicative of the results to be expected for the full year or for any other future year or interim period. The accompanying condensed financial statements should be read in conjunction with the audited financial statements and the related notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023 filed with the SEC.
Use of Estimates	Use of Estimates The preparation of the financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent liabilities at the date of the financial statements and reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates.
Cash, Cash Equivalents and Restricted Cash	Cash, Cash Equivalents and Restricted Cash The Company considers all highly liquid investments purchased with original maturities of three months or less at the date of purchase to be cash equivalents. Restricted cash represents a standby letter of credit issued pursuant to an office lease and value added tax return.
Revenue Recognition	Revenue Recognition The Company’s revenues are primarily derived through its license, research, development and commercialization agreements. The terms of these types of agreements may include (i) licenses for the Company’s technology or programs, (ii) research and development services, and (iii) services or obligations in connection with participation in research or steering committees. Payments to the Company under these arrangements typically include one or more of the following: non-refundable upfront and license fees, research funding, milestone and other contingent payments to the Company for the achievement of defined collaboration objectives and certain preclinical, clinical, regulatory and sales-based events, as well as royalties on sales of any commercialized products. The Company assesses whether the promises in its arrangements with customers are distinct performance obligations that should be accounted for separately. Judgment is required to determine whether the license to the Company’s intellectual property is distinct from the research and development services or participation on steering committees. The Company’s collaboration and license agreements may include contingent payments related to specified research, development and regulatory milestones. Such milestone payments are typically payable under the collaborations when the collaboration partner claims or selects a target, or initiates or advances a covered product candidate in preclinical or clinical development, upon submission for marketing approval of a covered product with regulatory authorities, or upon receipt of actual marketing approvals of a covered product or for additional indications. Milestone payments that are not within the control of the Company or the licensee, such as regulatory approvals, are not considered probable of being achieved until those approvals are received. At each reporting date, the Company re-evaluates whether the milestones are considered probable of being achieved and estimates the amount to be included in the transaction price by using the most likely amount method. If it is probable that a significant revenue reversal would not occur, the associated milestone value is included in the transaction price in such period of determination. The Company’s collaboration and license agreements may also include contingent payments related to sales-based milestones. Sales-based milestones are typically payable when annual sales of a covered product reach specified levels. Sales-based milestones are recognized at the later of when the associated performance obligation has been satisfied or when the sales occur. Unlike other contingency payments, such as regulatory milestones, sales-based milestones are not included in the transaction price based on estimates at the inception of the contract; instead, they are included when the sales or usage occur. Due to the early stage of the Company’s licensed technology, the license of such technology is typically combined with research and development services and steering committee participation as one performance obligation. Under the collaboration and license agreements, each collaboration target or program is generally considered to be a separate combined performance obligation. The transaction price in each arrangement is allocated to the identified performance obligations based on the relative standalone selling price (“SSP”) of each distinct performance obligation, which requires judgment. In instances where SSP is not directly observable, such as when a license or service is not sold separately, SSP is determined using information that may include market conditions and other observable inputs. Variable consideration is allocated to certain performance obligations if it is triggered by the Company’s efforts to satisfy or a specific outcome from satisfying these performance obligations. In the event that the Company receives non-cash consideration such as consideration in the form of a research license and research support services from the counterparty, the transaction price of a non-monetary exchange that has commercial substance is estimated based on the fair value of the non-cash consideration received, which may be determined through a valuation analysis. The Company recognizes revenue from upfront payments over the estimated period of performance under the agreement using an input method for the performance obligation. In applying the input method of revenue recognition, the Company uses actual full-time equivalent (FTE) hours incurred relative to estimated total FTE hours expected to be incurred for each combined performance obligation over the estimated research service period of each collaboration target. In certain cases, the Company’s performance creates an asset that does not have an alternative use to the customer and the Company has an enforceable right to payment at all times for performance completed to date. In these cases, the Company utilizes judgment to assess the nature of the combined performance obligation to determine whether the combined performance obligation is satisfied over time or at a point in time and, if over time, the appropriate method of measuring progress for purposes of recognizing revenue. The Company evaluates the measure of progress each reporting period and, if necessary, adjusts the measure of performance and related revenue recognition. Any consideration payable to the Company’s customers is treated as a reduction to the transaction price and revenue, unless the payment to the customer is in exchange for distinct good and services.
Contract Balances	Contract Balances Customer payments are recorded as deferred revenue upon receipt or when due and may require deferral of revenue recognition to a future period until the Company satisfies its performance obligations under these arrangements. Amounts payable to the Company are recorded as accounts receivable when the Company’s right to consideration is unconditional.
Segment	Segment The Company derives revenues through its collaboration and license agreements and determined that it operates as a single reportable segment which primarily focus on clinical and pre-clinical research programs. The Chief Operating Decision Maker ("CODM") primarily reviews the Company’s financial information on an aggregate basis. All long-lived assets are maintained in the United States of America.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In November 2023, the FASB issued ASU 2023-07, Segment Reporting - Improvements to Reportable Segment Disclosures ("ASU 2023-07"), which enhances transparency in income tax disclosures. ASU 2023-07 requires entities to provide incremental disclosures, if applicable, related to a public entity's reportable segments but does not change the definition of a segment, the method for determining segments, or the criteria for aggregating operating segments into reportable segment. ASU 2023-07 improves reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses, which enable users of financial statements to better understand the entity's measurement and assessment of segment performance and resource allocation. The new guidance is effective for public entities for fiscal years beginning after December 15, 2023, and interim periods in fiscal years beginning after December 15, 2024. The Company will adopt the ASU for its 2024 Form 10-K. The ASU is required to be applied on a retrospective basis. The Company is evaluating the impact on its financial statements. In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures ("ASU 2023-09"), which enhances transparency in income tax disclosures. ASU 2023-09 require entities to disclose (1) specific categories in the rate reconciliation, (2) the income or loss from continuing operations before income tax expense or benefit (separated between domestic and foreign) and (3) income tax expense or benefit from continuing operations (separated by federal, state and foreign). ASU 2023-09 also requires entities to disclose their income tax payments to international, federal, state and local jurisdictions, among other changes. The Company will adopt the ASU for its 2025 Form 10-K on a prospective basis. The Company is evaluating the impact on its financial statements.

- Definition

Disclosure of accounting policy for revenue from contract with customer.

+ References

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- Definition

Disclosure of accounting policy for segment reporting.

+ References

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+ Details

Accrued Liabilities - Summary of Accrued Liabilities (Details) - USD ($)
$ in Thousands

Sep. 30, 2024

Dec. 31, 2023

Accrued Liabilities, Current [Abstract]

Research and clinical expenses

$ 7,366

$ 8,435

Payroll and related expenses

7,410

8,160

Legal and professional expenses

1,674

690

Other accrued expenses

292

314

Total

$ 16,742

$ 17,599

^[1]

[1]	The condensed balance sheet as of December 31, 2023 was derived from the audited financial statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2023.

CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities:
Net income (loss)	$ 12,993	$ (1,406)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Amortization of intangible assets	109	109
Depreciation and amortization	1,246	1,580
Accretion of discounts on short-term investments	(4,524)	(5,193)
Stock-based compensation expense	5,784	6,006
Non-cash lease expense	3,027	2,765
Changes in operating assets and liabilities
Accounts receivable	80	33,567
Prepaid expenses and other assets	1,768	2,732
Accounts payable	(36)	(1,098)
Accrued liabilities and other long-term liabilities	(4,074)	(8,465)
Deferred revenue	(82,696)	(64,669)
Net cash used in operating activities	(66,323)	(34,072)
Cash flows from investing activities:
Purchases of property and equipment	(230)	(574)
Purchases of short-term investments	(105,706)	(312,966)
Maturities of short-term investments	190,501	150,000
Net cash provided by (used in) investing activities	84,565	(163,540)
Cash flows from financing activities:
Proceeds from issuance of pre-funded warrants and tranche warrants, net of issuance costs	0	29,669
Proceeds from issuance of common stock, net of issuance costs	4,843	0
Proceeds from employee purchase plan and exercise of stock options	430	317
Net cash provided by financing activities	5,273	29,986
Net increase (decrease) in cash, cash equivalents and restricted cash	23,515	(167,626)
Cash, cash equivalents and restricted cash, beginning of year	18,088	194,567
Cash, cash equivalents and restricted cash, end of year	$ 41,603	$ 26,941

Net Income (Loss) Per Share

9 Months Ended

Sep. 30, 2024

Earnings Per Share [Abstract]

Net Income (Loss) Per Share

3. Net Income (Loss) Per Share

Basic net income (loss) per share is calculated by dividing the net income (loss) by the weighted-average number of shares of common stock outstanding for the period. Diluted net income (loss) per share is calculated using the weighted-average number of common shares outstanding, plus potential dilutive common stock during the period. Diluted net loss per share is the same as basic net loss per share in the period when the effect of the potentially dilutive securities is anti-dilutive. The pre-funded warrants are included in both the basic and diluted EPS calculation.

The following table presents the calculation of basic and diluted net income (loss) per share:


	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2024		2023		2024		2023
	(in thousands, except share and per share data)
Numerator:
Net income (loss)	$	5,736	$	2,992	$	12,993	$	(1,406	)

Denominator:
Basic
Weighted-average common shares outstanding		78,170,101		66,779,192		77,081,967		66,523,404
Weighted-average pre-funded warrants		6,923,126		13,952,759		6,923,126		4,702,029
Weighted-average common shares outstanding used to calculate basic net income (loss) per share		85,093,227		80,731,951		84,005,093		71,225,433
Diluted
Weighted-average common shares outstanding used to calculate basic net income (loss) per share		85,093,227		80,731,951		84,005,093		71,225,433
Effect of potentially dilutive securities:
Stock options, ESPP & RSUs		111,482		259,771		423,750		—
Weighted-average common shares outstanding used to calculate diluted net income (loss) per share		85,204,709		80,991,722		84,428,843		71,225,433

Net income (loss) per share
Basic	$	0.07	$	0.04	$	0.15	$	(0.02	)
Diluted	$	0.07	$	0.04	$	0.15	$	(0.02	)


	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2024		2023		2024		2023

Options and ESPP to purchase common stock		14,583,619		13,863,671		14,262,791		14,046,593
Common stock warrants		11,538,462		11,162,208		11,538,462		3,720,736
RSUs		1,738,213		884,232		217,727		1,659,636
Total		27,860,294		25,910,111		26,018,980		19,426,965

License Agreement

9 Months Ended

Sep. 30, 2024

Research and Development [Abstract]

License Agreement

10. License Agreement

UCSB Agreement

In August 2010, the Company entered into an exclusive, worldwide license agreement with University of California, Santa Barbara (“UCSB”), relating to the use of certain patents and technology relating to its core technology, including its therapeutic antibodies, and to certain patent rights the Company co-owns with UCSB covering PROBODY antibodies and other pro-proteins (the “UCSB Agreement”). Pursuant to the UCSB Agreement, the Company is obligated to (i) make royalty payments to UCSB on net sales of its products covered under the agreement, subject to annual minimum amounts, (ii) make milestone payments to UCSB upon the occurrence of certain events, (iii) make a milestone payment to UCSB upon occurrence of an IPO or change of control, and (iv) reimburse UCSB for prosecution and maintenance of the licensed patents. As part of the UCSB Agreement, the Company has annual minimum royalty obligations of $0.2 million under the terms of certain exclusive licensed patent rights. In April 2019, the Company entered into Amendment No.3 to the UCSB Agreement to adjust and clarify certain sublicense terms (“Amendment No.3”). Under the terms of Amendment No.3, the Company and UCSB agreed to modify the determination of sublicense revenues payable by the Company to UCSB on certain existing collaboration agreements and on collaboration agreements executed subsequent to Amendment No.3. In exchange, the Company agreed to make an upfront payment of $1.0 million as well as additional annual license maintenance fees of $0.8 million through 2031.

In March 2024, the Company incurred $0.6 million of sublicense fees triggered by achieving the GLP toxicology studies milestone for the first clinical candidate which was nominated by Astellas in 2023, as well as by achieving the clinical candidate nomination milestone for a second collaboration target under the Astellas Agreement.

For the three and nine months ended September 30, 2024, the Company incurred sublicense expenses of $0 and $1.6 million, respectively, under the provisions of the UCSB Agreement. For the three and nine months ended September 30, 2023, the Company incurred sublicense expenses of $0 and $1.1 million under the provisions of the UCSB Agreement.

ImmunoGen (acquired by AbbVie in 2024)

In December 2019, the Company entered into a License Agreement (the “ImmunoGen 2019 License”) with ImmunoGen, Inc. to obtain an exclusive license with respect to epithelial cell adhesion molecule (“EPCAM”). Under the ImmunoGen 2019 License, ImmunoGen agreed to transfer its know-how, patents, intellectual property rights, and technology transfer materials and information related to its EpCAM program. The license gives the Company the sole ability to develop, manufacture, use and commercialize any licensed product that incorporates, is comprised of, or otherwise derived from PROBODY technology that targets EpCAM in any human therapeutic field on a worldwide basis.

In April 2024, the Company incurred a $5.0 million milestone payment to AbbVie (formerly ImmunoGen) with respect to achieving the milestone of dosing the first patient for CX-2051 under the ImmunoGen 2019 License Agreement.

Fair Value Measurements and Investments

9 Months Ended

Sep. 30, 2024

Fair Value Disclosures [Abstract]

Fair Value Measurements and Investments

4. Fair Value Measurements and Investments

In accordance with Accounting Standards Codification (“ASC”) 820-10, Fair Value Measurements and Disclosures, the Company determines the fair value of financial and non-financial assets and liabilities using the fair value hierarchy, which establishes three levels of inputs that may be used to measure fair value, as follows:

•

Level I: Inputs which include quoted prices in active markets for identical assets and liabilities.

•

Level II: Inputs other than Level I that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

•

Level III: Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

The carrying amounts of the Company’s financial instruments, including restricted cash, accounts receivable, accounts payable and accrued liabilities approximate fair value due to their relatively short maturities. The Company’s financial instruments consist of Level I and Level II assets which consist primarily of highly liquid money market funds, some of which are included in restricted cash and U.S. Treasury securities that are included in cash equivalents or short-term investments.

The following tables set forth the fair value of the Company’s investments subject to fair value measurements on a recurring basis and the level of inputs used in such measurements:


		September 30, 2024
	Valuation Hierarchy	Amortized Cost		Gross Unrealized Gains		Aggregate Fair Value
		(in thousands)
Assets
Money market funds	Level I	$	28,212	$	—	$	28,212
Restricted cash (money market funds)	Level I		1,027		—		1,027
U.S. Treasury Securities	Level II		89,349		40		89,389
Total		$	118,588	$	40	$	118,628


		December 31, 2023
	Valuation Hierarchy	Amortized Cost		Gross Unrealized Gains		Aggregate Fair Value
		(in thousands)
Assets
Money market funds	Level I	$	17,109	$	—	$	17,109
Restricted cash (money market funds)	Level I		917		—		917
U.S. Treasury Securities	Level II		157,243		95		157,338
Total		$	175,269	$	95	$	175,364

As of September 30, 2024, the remaining contractual terms of those investments are less than a year.

- 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

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+ Details