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Background and Basis of Presentation (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Accrued liabilities | $ 72,644 |  | $ 68,565 |  |  |
Equity | 1,337,882 | $ 1,243,343 | 609,635 | $ 498,378 | $ 462,927 | $ 498,829
Additional Paid-In Capital |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Equity | 1,706,855 | 1,645,352 | 1,030,577 | 907,908 | 890,258 | 916,095
Accumulated Deficit |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Equity | $ (368,148) | $ (400,912) | (422,601) | $ (411,504) | $ (422,093) | (416,292)
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Equity |  |  | (378,138) |  |  | (88)
Cumulative Effect, Period of Adoption, Adjustment | Additional Paid-In Capital |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Equity |  |  | (465,006) |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Accumulated Deficit |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Equity |  |  | 86,868 |  |  | $ (88)
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06 | Senior Notes |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Equity |  |  | 378,100 |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06 | Additional Paid-In Capital |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Equity |  |  | (465,000) |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06 | Accumulated Deficit |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Equity |  |  | 86,900 |  |  |
Revision of Prior Period, Reclassification, Adjustment |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Current operating lease liabilities |  |  | 6,600 |  |  |
Accrued liabilities |  |  | $ 6,600 |  |  |

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