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Fair Value Measurements (Details) - Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2020
Sep. 30, 2020
Jun. 30, 2020
[1]
Sep. 30, 2020
Sep. 30, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Conversion of convertible senior notes   $ 1,260 $ 9,473    
3.25% Convertible Senior Notes Due 2023 [Member]          
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
New issuance         $ 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  
New issuance         4,894
Change in fair value       624  
Balance   5,871   5,871 4,894
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  
Conversion of convertible senior notes       (10,733)  
Change in fair value       (2,757) 465
Payment-in-kind interest       1,138  
Balance   $ 38,401   $ 38,401 48,635
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         $ 10,254
[1] After giving effect to a 1 for 10 reverse stock split effective July 9, 2020.