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FAIR VALUE MEASUREMENTS - Changes to Fair Value Measurement Level 3 (Details) - Liabilities - Level 3 - Fair Value, Recurring - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Derivative liability, beginning balance $ 126,117 $ 79,069
Issuance of series warrants   6,640
Remeasurement to fair value 7,048 204,485
Derivative liability, ending balance 133,165 290,194
Series A Warrant Liabilities    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Derivative liability, beginning balance 11,291 0
Issuance of series warrants   6,640
Remeasurement to fair value 1,494 11,824
Derivative liability, ending balance 12,785 18,464
Series A Embedded Derivative Liabilities    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Derivative liability, beginning balance 18,448 26,728
Issuance of series warrants   0
Remeasurement to fair value 5,151 14,463
Derivative liability, ending balance 23,599 41,191
Series B Warrant Liabilities    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Derivative liability, beginning balance 96,378 52,341
Issuance of series warrants   0
Remeasurement to fair value 403 178,198
Derivative liability, ending balance $ 96,781 $ 230,539