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Warrants - Rollforward of Preferred Stock Warrants (Detail) - 6 months ended Jun. 30, 2015 - Preferred Stock Warrants [Member] - USD ($)
$ in Thousands
Total
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