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Fair Value Measurements - Schedule of Preferred Stock Warrant Liability and Derivative Liability Categorized with Level 3 (Detail)
$ in Thousands
6 Months Ended
Jun. 30, 2015
USD ($)
Preferred Stock Warrants [Member]  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Beginning balance $ 1,309
Change in fair value (1,309)
Extinguishment on conversion of convertible notes 0
Derivative Instruments [Member]  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Fair value at issuance date 1,558
Change in fair value 2,291
Extinguishment on conversion of convertible notes (3,838)
Ending balance $ 11