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Financial Assets Measured at Fair Value on Recurring Basis (Detail) - Fair Value Measurements, Recurring - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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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 | $ (33,436) | $ (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
Carrying Amount | 3.25% Convertible Senior Notes (due 2020) |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |
Convertible senior notes | $ (33,436) | (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

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