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FAIR VALUE MEASUREMENTS (Tables)
9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Schedule of Financial Instruments Measured at Fair Value The following table provides the financial instruments measured at fair value (in thousands):
September 30, 2021
Level 1Level 2Level 3Total
Assets
Cash equivalents:
Money market fund
$3,787$— $$3,787
Debt securities
Corporate debt securities— 34,363 — 34,363
Commercial paper— 20,740 — 20,740
U.S. government bonds— 80,840 — 80,840
Certificate of deposits— 24,523 — 24,523
Other— 10,329 — 10,329 
Total financial assets$3,787 $170,795 $— $174,582 

December 31, 2020
Level 1Level 2Level 3Total
Assets
Cash equivalents:
Money market fund
$67 $— $— $67 
Liabilities
Convertible preferred stock warrant liability
$— $— $95,342 $95,342 
Key Assumptions Used for Valuation
The key assumptions used for the valuation of the preferred stock warrant liabilities upon remeasurement were as follows:
Nine Months Ended
September 30,
2020
Volatility65.0 %
Risk-free interest rate0.1 %
Expected term (in years)1.8
Dividend yield— %
Discount for lack of marketability36.5 %
Schedule of Changes in Liability for Unobservable Inputs The following table presents the changes in the liability for the Company’s warrants during the nine months ended September 30, 2021 (in thousands):
Warrant Liability
Balance as of December 31, 2020$95,342 
Changes in estimated fair value(1,303)
Assumption of warrant liability upon Merger303,221 
Conversion of warrants upon Merger(59,442)
Exchange of warrants (168,647)
Exercised warrants(169,171)
Balance as of September 30, 2021$—