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FAIR VALUE MEASUREMENTS (Tables)
12 Months Ended
Dec. 31, 2022
Fair Value Disclosures [Abstract]  
Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis
The following table presents the Company’s fair value hierarchy for its financial assets and liabilities measured at fair value on a recurring basis (in thousands):
December 31, 2022
Total Assets at Fair ValueCash Equivalents and Restricted CashShort-Term Investments
Level 1:
Money market funds$27,993 $27,993 $— 
U.S. Treasury securities19,944 — 19,944 
Total Level 147,937 27,993 19,944 
Level 2:
Certificate of deposit75 75 — 
U.S. agency securities55,319 — 55,319 
Commercial paper35,756 5,972 29,784 
Total Level 291,150 6,047 85,103 
Total assets measured at fair value$139,087 $34,040 $105,047 
December 31, 2021
Total Assets at Fair ValueCash Equivalents and Restricted CashShort-Term Investments
Level 1:
Money market funds$237,897 $237,897 $— 
Level 2:
Certificate of deposit125 125 — 
Total assets measured at fair value$238,022 $238,022 $— 
The following tables present the Company’s fair value hierarchy for its financial liabilities measured at fair value on a recurring basis (in thousands):
December 31, 2022
Level 1Level 2Level 3Total
Liabilities:
Earnout warrant liabilities$— $163 $— $163 
Public common stock warrants2,066 — — 2,066 
Private common stock warrants— 980 — 980 
Total liabilities measured at fair value$2,066 $1,143 $— $3,209 
December 31, 2021
Level 1Level 2Level 3Total
Liabilities:
Earnout warrant liabilities$— $1,476 $— $1,476 
Public common stock warrants18,666 — — 18,666 
Private common stock warrants— 8,855 — 8,855 
Total liabilities measured at fair value$18,666 $10,331 $— $28,997 
Schedule of Changes in Fair Value Liabilities on Recurring Basis
The following table sets forth a summary of changes in the fair value of the Company’s Level 3 liabilities at fair value on a recurring basis for the years ended December 31, 2022 and 2021 (in thousands):
20222021
Bridge loan:
Beginning balance January 1$— $— 
Fair value of Bridge loan funded— 20,000 
Accrued interest— 1,578 
Change in fair value— — 
Repayment of loan principal and interest— (21,578)
Ending balance December 31
— — 
Legacy ESS Warrant liabilities:
Beginning balance January 1— 3,329 
Change in fair value— 17,753 
Fair value of warrants issued— 5,096 
Fair value of warrants exercised— (26,178)
Ending balance December 31
— — 
Series C-2 Redeemable Convertible Preferred Stock Issuance Right liability:
Beginning balance January 1— 22,911 
Change in fair value— 223,165 
Fair value of derivatives extinguished— (23,152)
Fair value of Series C-2 Redeemable Convertible Preferred Stock Issuance Right exercised— (222,924)
Ending balance December 31
— — 
Total$— $—