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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.

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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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