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Summary of Borrowings (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Aug. 10, 2015
Debt Instrument [Line Items]      
Note payable to principal stockholder - net carrying amount $ 49,521 $ 49,521  
Senior convertible notes due December 31, 2019      
Debt Instrument [Line Items]      
Principal amount 75,000 80,000  
Unamortized debt discount (3,661) (5,418)  
Net carrying amount 71,339 74,582  
5.75% Senior convertible notes due August 15, 2018      
Debt Instrument [Line Items]      
Principal amount 27,690 27,690 $ 27,700
Unamortized premium 426 660 $ 700
Unaccreted debt issuance costs (481) (737)  
Net carrying amount $ 27,635 $ 27,613