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Stock-based Compensation - Stock Option Activity and Related Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Outstanding at December 31, 2015 (in shares) 4,151,962  
Granted (in shares) 1,219,675  
Canceled and forfeited (in shares) (300,713)  
Exercised (in shares) (348,983)  
Outstanding at December 31, 2016 (in shares) 4,721,941 4,151,962
Options vested and expected to vest at December 31, 2016 (in shares) 4,423,662  
Options exercisable at December 31, 2016 (in shares) 2,666,260  
Weighted- average exercise price per share    
Outstanding at December 31, 2015 (in dollars per share) $ 10.98  
Granted (in dollars per share) 14.51  
Canceled and forfeited (in dollars per share) 12.85  
Exercised (in dollars per share) 7.94  
Outstanding at December 31, 2016 (in dollars per share) 12.00 $ 10.98
Options vested and expected to vest at December 31, 2016 (in dollars per share) 11.83  
Options exercisable at December 31, 2016 (in dollars per share) $ 10.03  
Weighted- average remaining contractual term (in years)    
Outstanding 7 years 4 months 28 days 7 years 9 months 22 days
Options vested and expected to vest as December 31, 2016 7 years 3 months 29 days  
Options exercisable at December 31, 2016 6 years 6 months  
Aggregate intrinsic value (in thousands)    
Outstanding $ 48,670 $ 18,943
Options vested and expected to vest at December 31, 2016 46,353  
Options exercisable at December 31, 2016 $ 32,714