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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2024
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
The following tables present the fair value hierarchy for assets and liabilities measured at fair value on a recurring basis (in thousands):
As of September 30, 2024
Level 1Level 2Level 3Total
Cash and cash equivalents:
Money market funds$48,685 $— $— $48,685 
U.S. government treasury bills21,228 — — 21,228 
Term deposits (greater than 90 days)(1)(2)
— 1,058 — 1,058 
Payment-dependent notes receivable, non-current— — 7,436 7,436 
Total financial assets$69,913 $1,058 $7,436 $78,407 
Payment-dependent notes payable, non-current$— $— $7,436 $7,436 
December 2023 Warrants(3)
— 628 — 628 
Private Placement Warrants— — 1,330 1,330 
Total financial liabilities$— $628 $8,766 $9,394 
As of December 31, 2023
Level 1Level 2Level 3Total
Cash and cash equivalents:
Money market funds$130,132 $— $— $130,132 
Term deposits (less than 90 days)— 2,221 — 2,221 
Payment-dependent notes receivable, non-current— — 5,593 5,593 
Term deposits (greater than 90 days)(1)(2)
— 7,694 — 7,694 
Total financial assets$130,132 $9,915 $5,593 $145,640 
Payment-dependent notes payable, non-current$— $— $5,593 $5,593 
December 2023 Warrants(3)
— 4,889 — 4,889 
Private Placement Warrants— — 4,727 4,727 
Total financial liabilities$— $4,889 $10,320 $15,209 
(1) Included in Prepaid expenses and other current assets on the unaudited condensed consolidated balance sheets as of September 30, 2024 and December 31, 2023.
(2) Includes $0.7 million and $1.0 million term deposits required to fulfill the Company's obligations in connection with real estate lease agreements as of September 30, 2024 and December 31, 2023, respectively.
(3) On December 18, 2023, the then outstanding Junior Preferred Stock Warrants were modified and replaced with the December 2023 Warrants. See Note 10, "Warrants" for additional information.
Fair Value Measurement Inputs and Valuation Techniques The Company estimated the fair value of the Private Placement Warrant liabilities, as of September 30, 2024 and December 31, 2023, respectively, using the following key assumptions:
September 30,
2024		December 31,
2023
Fair value of underlying securities$1.31$3.43
Expected term (years)2.53.2
Expected volatility112.5%117.0%
Risk-free interest rate3.6%4.0%
Expected dividend yield0.0%0.0%
Fair value per warrant$0.18$0.64
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
The Company recorded changes in the fair value of the liability related to the Private Placement Warrants for the three and nine months ended September 30, 2024, and 2023, as follows:
Three months ended September 30,Nine months ended September 30,
2024202320242023
Balance as of beginning of period$1,847 $2,760 $4,727 $222 
Change in fair value of warrant liability(1)
(517)(544)(3,397)1,994 
Balance as of September 30,$1,330 $2,216 $1,330 $2,216 

(1) The change in fair value of warrant liability is recorded in the unaudited condensed consolidated statements of operations within Change in fair value of warrant liabilities.
The following tables provide reconciliation for all financial assets and liabilities measured at fair value using significant unobservable inputs (Level 3) for the nine months ended September 30, 2024 and 2023 (in thousands):
Total Level 3 Financial AssetsTotal Level 3 Financial Liabilities
Balance as of December 31, 2023$5,593 $10,320 
Change in fair value of payment-dependent notes receivable1,843 — 
Change in fair value of payment-dependent notes payable— 1,843 
Change in fair value of Private Placement Warrants— (3,397)
Balance as of September 30, 2024$7,436 $8,766 
Total Level 3 Financial AssetsTotal Level 3 Financial Liabilities
Balance as of December 31, 2022$7,371 $7,977 
Change in fair value of payment-dependent notes receivable(1,608)— 
Change in fair value of payment-dependent notes payable— (1,608)
Change in fair value of Junior Preferred Stock Warrants(1)
— 721 
Change in fair value of Private Placement Warrants— 1,994 
Balance as of September 30, 2023$5,763 $9,084 
(1) On December 18, 2023, the Junior Preferred Stock Warrants were modified and replaced with the December 2023 Warrants and transferred from Level 3 to Level 2 upon modification as these warrants are valued using a Black-Scholes Option pricing model using observable market inputs. See Note 10, "Warrants" for additional information.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation
The following tables provide reconciliation for all financial assets and liabilities measured at fair value using significant unobservable inputs (Level 3) for the nine months ended September 30, 2024 and 2023 (in thousands):
Total Level 3 Financial AssetsTotal Level 3 Financial Liabilities
Balance as of December 31, 2023$5,593 $10,320 
Change in fair value of payment-dependent notes receivable1,843 — 
Change in fair value of payment-dependent notes payable— 1,843 
Change in fair value of Private Placement Warrants— (3,397)
Balance as of September 30, 2024$7,436 $8,766 
Total Level 3 Financial AssetsTotal Level 3 Financial Liabilities
Balance as of December 31, 2022$7,371 $7,977 
Change in fair value of payment-dependent notes receivable(1,608)— 
Change in fair value of payment-dependent notes payable— (1,608)
Change in fair value of Junior Preferred Stock Warrants(1)
— 721 
Change in fair value of Private Placement Warrants— 1,994 
Balance as of September 30, 2023$5,763 $9,084 
(1) On December 18, 2023, the Junior Preferred Stock Warrants were modified and replaced with the December 2023 Warrants and transferred from Level 3 to Level 2 upon modification as these warrants are valued using a Black-Scholes Option pricing model using observable market inputs. See Note 10, "Warrants" for additional information.