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Fair Value Measurements (Details) - Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation - Fair Value, Recurring [Member] - Fair Value, Inputs, Level 3 [Member] - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Redeemable Preferred Stock [Member]    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance $ 8,062 $ 5,247
Change in fair value 9,013 624
Balance 17,075 5,871
3.25% Convertible Senior Notes Due 2023 [Member]    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance 34,134 50,753
Conversion of convertible senior notes (50,759) (10,733)
Change in fair value 16,495 (2,757)
Payment-in-kind interest 312 1,138
Balance $ 182 $ 38,401