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FAIR VALUE MEASUREMENTS - Change in Level 3 Financial Instruments (Details) - Private Placement Warrants
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Additions $ 38,304
Loss / (Gain) on fair value adjustments included in earnings 5,573
Ending balance $ 43,877