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Fair Value Measurements - Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018 | Jul. 26, 2018 | Aug. 31, 2017
--- | --- | --- | --- | ---
3.25% Convertible Senior Notes (due 2020) |  |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |  |
Debt instrument, interest rate | 3.25% | 3.25% | 3.25% | 3.25%
3.25% convertible senior notes due 2023 |  |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |  |
Debt instrument, interest rate | 3.25% |  |  |
Accrued paid-in-kind interest | $ 100 |  |  |
Level 1 | 3.25% Convertible Senior Notes (due 2020) | Fair Value Measurements, Recurring |  |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |  |
Convertible senior notes | 0 | $ 0 |  |
Level 1 | 3.25% convertible senior notes due 2023 | Fair Value Measurements, Recurring |  |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |  |
Convertible senior notes | 0 |  |  |
Level 2 | 3.25% Convertible Senior Notes (due 2020) | Fair Value Measurements, Recurring |  |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |  |
Convertible senior notes | 0 | 0 |  |
Level 2 | 3.25% convertible senior notes due 2023 | Fair Value Measurements, Recurring |  |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |  |
Convertible senior notes | 0 |  |  |
Level 3 | 3.25% Convertible Senior Notes (due 2020) | Fair Value Measurements, Recurring |  |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |  |
Convertible senior notes | 0 | 27,974 |  |
Level 3 | 3.25% convertible senior notes due 2023 | Fair Value Measurements, Recurring |  |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |  |
Convertible senior notes | 48,635 |  |  |
Carrying Amount | 3.25% Convertible Senior Notes (due 2020) | Fair Value Measurements, Recurring |  |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |  |
Convertible senior notes | 0 | $ 27,974 |  |
Carrying Amount | 3.25% convertible senior notes due 2023 | Fair Value Measurements, Recurring |  |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |  |
Convertible senior notes | 48,635 |  |  |
Redeemable Preferred Stock | Level 1 | Fair Value Measurements, Recurring |  |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |  |
Convertible senior notes | 0 |  |  |
Redeemable Preferred Stock | Level 2 | Fair Value Measurements, Recurring |  |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |  |
Convertible senior notes | 0 |  |  |
Redeemable Preferred Stock | Level 3 | Fair Value Measurements, Recurring |  |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |  |
Convertible senior notes | 4,894 |  |  |
Redeemable Preferred Stock | Carrying Amount | Fair Value Measurements, Recurring |  |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |  |
Convertible senior notes | $ 4,894 |  |  |

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