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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
12 Months Ended
Dec. 31, 2021
Dec. 31, 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 13,220 2,815
Balance 21,282 8,062
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 (50,760) (20,212)
Change in fair value 16,419 2,265
Payment-in-kind interest 207 1,328
Balance $ 0 $ 34,134