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Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value Measurements, Level 3 | 3.25% Convertible Senior Notes (due 2020) |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |
Convertible senior notes | $ 22,469 |
Cash Equivalents | Fair Value Measurements, Level 1 |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |
Assets measured at fair value on recurring basis | 13,718 | $ 15,312
Carrying Amount | 3.25% Convertible Senior Notes (due 2020) |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |
Convertible senior notes | 22,469 |
Carrying Amount | Cash Equivalents |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |
Assets measured at fair value on recurring basis | $ 13,718 | $ 15,312

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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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