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Summary of Senior Convertible Notes (Detail) - Entity [Domain] - Senior convertible notes due August 15, 2015 - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Aug. 18, 2010
Debt Instrument [Line Items]      
Principal amount $ 100,000 $ 100,000 $ 100,000
Unaccreted debt issuance expense (164) (645)  
Net carrying amount $ 99,836 $ 99,355