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Debt - Summary of Convertible Senior Notes (Detail) - USD ($) | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Aug. 31, 2019 | Aug. 09, 2019 | Jul. 26, 2018 | Aug. 31, 2017 | Jun. 30, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal/ Fair Value Amount | $ 52,658,000 | $ 140,974,000 |  |  |  |  |  |
Debt Issuance Costs | 0 | 1,182,000 |  |  |  |  |  |
Net Amount | 52,658,000 | 139,792,000 |  |  |  |  |  |
Payment-in-kind interest | 1,725,000 | 0 | $ 0 |  |  |  |  |
4.875% Convertible Senior Notes Due 2020 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal/ Fair Value Amount | 1,905,000 | 113,000,000 |  |  | $ 113,000,000 |  |  | $ 115,000,000
Debt Issuance Costs | 0 | 1,182,000 |  |  |  |  |  |
Net Amount | $ 1,905,000 | 111,818,000 |  |  |  |  |  |
Debt instrument, interest rate | 4.875% |  |  | 4.875% |  |  |  | 4.875%
3.25% Convertible Senior Notes Due 2020 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal/ Fair Value Amount | $ 0 | 27,974,000 |  |  |  | $ 8,000,000.0 |  |
Debt Issuance Costs | 0 | 0 |  |  |  |  |  |
Net Amount | $ 0 | 27,974,000 |  |  |  |  |  |
Debt instrument, interest rate | 3.25% |  |  |  |  | 3.25% |  |
3.25% Convertible Senior Notes Due 2023 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal/ Fair Value Amount | $ 50,753,000 | 0 |  |  |  |  |  |
Debt Issuance Costs | 0 | 0 |  |  |  |  |  |
Net Amount | $ 50,753,000 | 0 |  |  |  |  |  |
Debt instrument, interest rate | 3.25% |  |  | 3.25% |  | 3.25% |  |
Oasis Management and Oasis Investments ll Master Fund Ltd. | 3.25% Convertible Senior Notes Due 2020 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal/ Fair Value Amount | $ 0 | 29,600,000.0 |  |  |  | $ 8,000,000 | $ 21,600,000 |
Oasis Management and Oasis Investments ll Master Fund Ltd. | 3.25% Convertible Senior Notes Due 2023 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal/ Fair Value Amount | 37,600,000 | $ 0 |  | $ 8,000,000.0 |  |  |  |
Payment-in-kind interest | $ 400,000 |  |  |  |  |  |  |

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