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
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
Private Warrants  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Balance at December 31, 2020 $ 4,604
Change in fair value (1,346)
Balance at March 31, 2021 3,258
RTI Warrants  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Balance at December 31, 2020 0
Change in fair value 15,000
Balance at March 31, 2021 $ 15,000