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
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 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 (1,705)  
Ending Balance 2,899 $ 2,899
RTI warrants    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance   0
Change in fair value   15,000
Ending Balance $ 15,000 $ 15,000