Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE OF FINANCIAL INSTRUMENTS - Level 3 Liabilities Measured at Fair Value (Details)

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FAIR VALUE OF FINANCIAL INSTRUMENTS - Level 3 Liabilities Measured at Fair Value (Details) - Level 3 - USD ($)
$ in Thousands
6 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Private warrants    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance $ 4,604  
Change in fair value (3,288)  
Ending Balance 1,316 $ 1,316
RTI warrants    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance   0
Change in fair value   8,214
Ending Balance $ 8,214 $ 8,214