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Stock-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Options, Granted 1,328,500 1,078,000 774,000
2014 Equity Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Options, Outstanding at December 31, 2016 2,548,408    
Number of Options, Granted 1,328,500    
Number of Options, Exercised (247,892)    
Number of Options, Forfeited (136,875)    
Number of Options, Outstanding at December 31, 2017 3,492,141 2,548,408  
Number of Options, Outstanding, Weighted average remaining contractual life as of December 31, 2017 8 years    
Number of Options, Options exercisable at December 31, 2017 1,556,102    
Number of Options, Exercisable, Weighted average remaining contractual life as of December 31, 2017 6 years 11 months 15 days    
Number of Options, Options vested and expected to vest at December 31, 2017 3,492,141    
Number of Options, Vested and expected to vest, Weighted average remaining contractual life as of December 31, 2017 8 years    
Weighted-Average Exercise Price, Outstanding at December 31, 2016 $ 8.75    
Weighted-Average Exercise Price, Granted 16.16    
Weighted-Average Exercise Price, Exercised 6.85    
Weighted-Average Exercise Price, Forfeited 7.55    
Weighted-Average Exercise Price, Outstanding at December 31, 2017 11.75 $ 8.75  
Weighted-Average Exercise Price, Options exercisable at December 31, 2017 10.25    
Weighted-Average Exercise Price, Options vested and expected to vest at December 31, 2017 $ 11.75    
Aggregate Intrinsic Value, Outstanding at December 31, 2017 $ 7,739    
Aggregate Intrinsic Value, Options exercisable at December 31, 2017 4,451    
Aggregate Intrinsic Value, Options vested and expected to vest at December 31, 2017 $ 7,739