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Summary of Senior Convertible Notes (Detail) - Senior convertible notes due August 15, 2018 - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Aug. 10, 2015
Debt Instrument [Line Items]      
Principal amount $ 27,690 $ 27,690 $ 27,700
Unamortized premium 603 660 $ 700
Unaccreted debt issuance costs (675) (737)  
Net carrying amount $ 27,618 $ 27,613