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Carrying Value of Convertible Senior Notes (Detail) - 2.125% Convertible Senior Notes due 2021 - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |
Principal amount | $ 114,989 | $ 115,000
Unamortized debt discount | (12,513) | (13,395)
Unamortized debt issuance costs | (2,200) | (2,355)
Total convertible senior notes | $ 100,276 | $ 99,250

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