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Fair Value Measurements - Financial Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Aug. 31, 2019 | Dec. 31, 2018 | Jul. 26, 2018
--- | --- | --- | --- | ---
Carrying Amount |  |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |  |
Preferred stock derivative liability | $ 5,247 |  |  |
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% Convertible Senior Notes Due 2020 | Carrying Amount |  |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |  |
Assets measured at fair value on recurring basis | $ 0 |  | $ 27,974 |
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% | 3.25% |  | 3.25%
3.25% Convertible Senior Notes Due 2023 | Carrying Amount |  |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |  |
Assets measured at fair value on recurring basis | $ 50,753 |  |  |
Level 1 |  |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |  |
Preferred stock derivative liability | 0 |  |  |
Level 1 | 3.25% Convertible Senior Notes Due 2020 |  |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |  |
Assets measured at fair value on recurring basis | 0 |  | 0 |
Level 1 | 3.25% Convertible Senior Notes Due 2023 |  |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |  |
Assets measured at fair value on recurring basis | 0 |  |  |
Level 2 |  |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |  |
Preferred stock derivative liability | 0 |  |  |
Level 2 | 3.25% Convertible Senior Notes Due 2020 |  |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |  |
Assets measured at fair value on recurring basis | 0 |  | 0 |
Level 2 | 3.25% Convertible Senior Notes Due 2023 |  |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |  |
Assets measured at fair value on recurring basis | 0 |  |  |
Level 3 |  |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |  |
Preferred stock derivative liability | 5,247 |  |  |
Level 3 | 3.25% Convertible Senior Notes Due 2020 |  |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |  |
Assets measured at fair value on recurring basis | 0 |  | $ 27,974 |
Level 3 | 3.25% Convertible Senior Notes Due 2023 |  |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |  |
Assets measured at fair value on recurring basis | $ 50,753 |  |  |

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