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Warrants - Rollforward of Preferred Stock Warrants (Detail) - Preferred Stock Warrants [Member]
$ in Thousands
 9 Months Ended
Sep. 30, 2015
USD ($)
shares
Class of Warrant or Right [Line Items]  
Preferred Stock Warrants, beginning balance 14,544,247
Decrease in estimated fair value of warrants 0
Cancellation and gain (loss) on extinguishment (14,544,247)
Preferred Stock Warrants, ending balance 0
Beginning balance | $ $ 1,309
Decrease in estimated fair value of warrants | $ (1,309)
Cancellation and gain (loss) on extinguishment | $ $ 0