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Equity and Liability Components of Notes (Detail) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Principal amount of the Notes outstanding $ 233,825 $ 239,097
Unamortized discount and fees of liability component (1,905) (3,164)
Less: current portion (45,822) (2,468)
Long-term debt 186,098 233,465
Convertible Senior Notes    
Debt Instrument [Line Items]    
Principal amount of the Notes outstanding 44,938 48,951
Unamortized discount and fees of liability component (1,396) (2,183)
Net carrying amount of liability component 43,542 46,768
Less: current portion (43,542) 0
Long-term debt 0 46,768
Carrying value of equity component, net of issuance costs $ (7,289) $ (3,971)
Remaining amortization period of discount on the liability component 9 months 18 days 1 year 3 months 18 days