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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 | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 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 | 9,013 | 624
Balance | 17,075 | 5,871
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 | (50,759) | (10,733)
Change in fair value | 16,495 | (2,757)
Payment-in-kind interest | 312 | 1,138
Balance | $ 182 | $ 38,401

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