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FAIR VALUE OF FINANCIAL INSTRUMENTS - Reconciliation of the Contingent Forward Contract Liability (Details) - Contingent forward contracts liability - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance $ 30,844 $ 15,791
Change in fair value   15,053
Ending balance   $ 30,844
Series D contingent forward contract liability    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Change in fair value 8,720  
Settlement of Series (39,563)  
Series E contingent forward contract liability    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Change in fair value 109,662  
Settlement of Series (110,456)  
Issuance of Series $ 793