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Summary of Significant Accounting Policies - Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Level 1 | 3.25% Convertible senior notes due in 2020 |  |  |
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 in 2020 |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |
Convertible senior notes | 0 | 0 |
Level 3 | 3.25% Convertible senior notes due in 2020 |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |
Convertible senior notes | 27,974 | 22,469 |
Cash Equivalents | Level 1 |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |
Assets measured at fair value on recurring basis | 0 | 13,718 |
Cash Equivalents | Level 2 |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |
Assets measured at fair value on recurring basis | 0 | 0 |
Cash Equivalents | Level 3 |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |
Assets measured at fair value on recurring basis | 0 | 0 |
Carrying Amount | 3.25% Convertible senior notes due in 2020 |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |
Convertible senior notes | 27,974 | 22,469 | $ 0
Carrying Amount | Cash Equivalents |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |
Assets measured at fair value on recurring basis | $ 0 | $ 13,718 |

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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