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Stock-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Number of options, Outstanding beginning balance 732,823  
Number of options, Granted 1,540,388  
Number of options, Options assumed in Merger 24,400  
Number of options, Exercised (71,323)  
Number of options, Forfeited or expired (2,018)  
Number of options, Outstanding ending balance 2,224,270 732,823
Number of options, Exercisable 813,167  
Number of options, Vested and expected to vest 2,094,163  
Weighted average exercise price, Outstanding beginning balance $ 2.08  
Weighted average exercise price, Granted 11.51  
Weighted average exercise price, Options assumed in Merger 14.07  
Weighted average exercise price, Exercised 2.12  
Weighted average exercise price, Forfeited or expired 2.12  
Weighted average exercise price, Outstanding ending balance 8.75 $ 2.08
Weighted average exercise price, Exercisable 4.61  
Weighted average exercise price, Vested and expected to vest $ 8.66  
Weighted average remaining contractual term, Outstanding beginning balance 8 years 7 months 24 days 6 years 8 months 23 days
Weighted average remaining contractual term, Exercisable 6 years 11 months 12 days  
Weighted average remaining contractual term, Vested and expected to vest 8 years 7 months 6 days  
Aggregate intrinsic value, Outstanding beginning balance $ 5,508  
Aggregate intrinsic value, Outstanding ending balance 1,875 $ 5,508
Aggregate intrinsic value, Exercisable 1,706  
Aggregate intrinsic value, Vested and expected to vest $ 1,825