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Fair Value Measurements (Details) - Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Balance   $ 0 $ 27,974
New issuance   0 7,250
Conversion of convertible senior notes [1]   20,212  
Loss on extinguishment of convertible senior notes   0 10,417
Extinguishment of convertible senior notes   0 (48,170)
Change in fair value   0 2,529
Balance   0 0
3.25% Convertible Senior Notes Due 2023 [Member]      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
New issuance   0 37,916
Conversion of convertible senior notes $ 9,500    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Redeemable Preferred Stock [Member]      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Balance   5,247 0
New issuance   0 4,894
Change in fair value   2,815 353
Balance   8,062 5,247
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | 3.25% Convertible Senior Notes Due 2023 [Member]      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Balance   50,753 0
Conversion of convertible senior notes   (20,212) 0
Change in fair value   2,265 2,583
Payment-in-kind interest   1,328 0
Balance   34,134 50,753
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Oasis Management And Oasis Investments ll Master Fund Ltd. [Member]      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
New issuance   $ 0 $ 10,254
[1] After giving effect to a 1 for 10 reverse stock split effective July 9, 2020.