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Equity and Liability Components of Notes (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |
Principal amount of the Notes outstanding | $ 239,097 | $ 323,548
Unamortized discount and fees of liability component | (3,164) | (11,052)
Less: current portion | (2,468) | (37,611)
Long-term debt | 233,465 | 274,885
Convertible Senior Notes |  |
Debt Instrument [Line Items] |  |
Principal amount of the Notes outstanding | 48,951 | 131,000
Unamortized discount and fees of liability component | (2,183) | (9,888)
Net carrying amount of liability component | 46,768 | 121,112
Less: current portion | 0 | (35,165)
Long-term debt | 46,768 | 85,947
Carrying value of equity component, net of issuance costs | $ (3,971) | $ 15,810
Remaining amortization period of discount on the liability component | 1 year 3 months 18 days | 2 years 3 months 18 days

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