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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2023
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, 2023
Level 1Level 2Level 3Total
Cash and cash equivalents:
Money market funds$123,824 $— $— $123,824 
Payment-dependent notes receivable, non-current— — 5,763 5,763 
Certificates of deposit(1)(2)
— 3,130 — 3,130 
Total financial assets$123,824 $3,130 $5,763 $132,717 
Payment-dependent notes payable, non-current— — 5,763 5,763 
Junior preferred stock warrants— — 1,105 1,105 
Private placement warrants— — 2,216 2,216 
Total financial liabilities$— $— $9,084 $9,084 
As of December 31, 2022
Level 1Level 2Level 3Total
Cash and cash equivalents:
Money market funds$149,139 $— $— $149,139 
Payment-dependent notes receivable, non-current— — 7,371 7,371 
Total financial assets$149,139 $— $7,371 $156,510 
Payment-dependent notes payable, non-current— — 7,371 7,371 
Junior preferred stock warrants— — 384 384 
Private placement warrants— — 222 222 
Total financial liabilities$— $— $7,977 $7,977 
(1) Included in prepaid expenses and other current assets on the unaudited condensed consolidated balance sheets as of September 30, 2023 and consolidated balance sheets as of December 31, 2022.
(2) Includes $1.0 million certificates of deposit required to fulfill the Company's obligations in connection with real estate lease agreements.
Fair Value Measurement Inputs and Valuation Techniques
The Company estimated the fair value of the Junior Preferred Stock Warrants as of September 30, 2023 and December 31, 2022, respectively, using the following key assumptions:    
September 30,
2023		December 31,
2022
Fair value of underlying securities$2.03$1.73
Expected term (years)2.112.9
Expected volatility105.0%46.1%
Risk-free interest rate5.0%4.2%
Expected dividend yield0.0%0.0%
Fair value per warrant $0.42$0.15
The significant assumptions used in the analysis were the trading price of the Company’s common stock as of September 30, 2023 and December 31, 2022, respectively, using the following key assumptions:
September 30,
2023		December 31,
2022
Fair value of underlying securities$2.03$1.73
Expected term (years)3.54.2
Expected volatility107.5%44.6%
Risk-free interest rate4.8%4.1%
Expected dividend yield0.0%0.0%
Fair value per warrant$0.30$0.03
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, 2023 and 2022 (in thousands):
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— 721 
Change in fair value of Private Placement Warrants— 1,994 
Balance as of September 30, 2023$5,763 $9,084 
Total Level 3 Financial AssetsTotal Level 3 Financial Liabilities
Balance as of December 31, 2021$13,453 $21,297 
Change in fair value of payment-dependent notes receivable(6,945)— 
Change in fair value of payment-dependent notes payable— (6,945)
Change in fair value of Series B-1 Preferred Stock Warrant liability— 106 
Settlement of Series B-1 Preferred Stock Warrant liability via conversion to equity-classified common stock warrants— (2,950)
Exercise of Junior Preferred Stock Warrants— (653)
Change in fair value of Junior Preferred Stock Warrants— (3,937)
Transfer of Private Placement Warrants out of Level 2 to Level 3— 20,461 
Change in fair value of Private Placement Warrants— (20,239)
Balance as of September 30, 2022$6,508 $7,140 
Fair Value, Liabilities 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, 2023 and 2022 (in thousands):
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— 721 
Change in fair value of Private Placement Warrants— 1,994 
Balance as of September 30, 2023$5,763 $9,084 
Total Level 3 Financial AssetsTotal Level 3 Financial Liabilities
Balance as of December 31, 2021$13,453 $21,297 
Change in fair value of payment-dependent notes receivable(6,945)— 
Change in fair value of payment-dependent notes payable— (6,945)
Change in fair value of Series B-1 Preferred Stock Warrant liability— 106 
Settlement of Series B-1 Preferred Stock Warrant liability via conversion to equity-classified common stock warrants— (2,950)
Exercise of Junior Preferred Stock Warrants— (653)
Change in fair value of Junior Preferred Stock Warrants— (3,937)
Transfer of Private Placement Warrants out of Level 2 to Level 3— 20,461 
Change in fair value of Private Placement Warrants— (20,239)
Balance as of September 30, 2022$6,508 $7,140