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Summary of Senior Convertible Notes (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Aug. 14, 2015
Aug. 10, 2015
Dec. 31, 2014
Senior convertible notes due August 15, 2015        
Debt Instrument [Line Items]        
Principal amount $ 100,000 $ 32,100   $ 100,000
Unaccreted debt issuance costs       (645)
Net carrying amount       $ 99,355
Senior convertible notes due August 15, 2018        
Debt Instrument [Line Items]        
Principal amount 27,690   $ 27,700  
Unamortized premium 717   $ 717  
Unaccreted debt issuance costs (800)      
Net carrying amount $ 27,607