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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.

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