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Summary of Borrowings (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Note payable to principal stockholder-net carrying amount $ 79,666 $ 49,521
Senior convertible notes due December 31, 2019    
Debt Instrument [Line Items]    
Principal amount 60,000 75,000
Unamortized debt discount (2,516) (3,661)
Net carrying amount 57,484 71,339
5.75% Senior convertible notes due August 15, 2018    
Debt Instrument [Line Items]    
Principal amount 27,690 27,690
Unamortized premium 306 426
Unaccreted debt issuance costs (347) (481)
Net carrying amount $ 27,649 $ 27,635