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Fair Value Measurements - Reconciliation of Company's Liabilities Measured at Fair Value on Recurring Basis Using Unobservable Inputs (Level 3) (Detail) - Significant Unobservable Inputs (Level 3) [Member]
$ in Thousands
 12 Months Ended
Dec. 31, 2014
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Preferred stock warrant liability, Beginning balance $ 928
Fair value reclassified to additional paid-in capital in connection with the completion of the IPO on April 15, 2014 (928)
Preferred Stock Warrant, Series B [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Preferred stock warrant liability, Beginning balance 4
Fair value reclassified to additional paid-in capital in connection with the completion of the IPO on April 15, 2014 (4)
Preferred Stock Warrant, Series C [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Preferred stock warrant liability, Beginning balance 386
Fair value reclassified to additional paid-in capital in connection with the completion of the IPO on April 15, 2014 (386)
Preferred Stock Warrant, Series D [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Preferred stock warrant liability, Beginning balance 538
Fair value reclassified to additional paid-in capital in connection with the completion of the IPO on April 15, 2014 $ (538)