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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, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Outstanding at December 31, 2015 (in shares) 5,042,352  
Granted (in shares) 835,376  
Canceled and forfeited (in shares) (269,421)  
Exercised (in shares) (1,416,185)  
Outstanding at December 31, 2016 (in shares) 4,192,122 5,042,352
Options vested and expected to vest at December 31, 2016 (in shares) 4,192,122  
Options exercisable at December 31, 2016 (in shares) 2,792,940  
Weighted- average exercise price per share    
Outstanding at December 31, 2015 (in dollars per share) $ 12.46  
Granted (in dollars per share) 23.98  
Canceled and forfeited (in dollars per share) 14.90  
Exercised (in dollars per share) 13.82  
Outstanding at December 31, 2016 (in dollars per share) 14.42 $ 12.46
Options vested and expected to vest at December 31, 2016 (in dollars per share) 14.42  
Options exercisable at December 31, 2016 (in dollars per share) $ 12.61  
Weighted- average remaining contractual term (in years)    
Outstanding 6 years 5 months 19 days 6 years 5 months 25 days
Options vested and expected to vest as December 31, 2016 6 years 5 months 19 days  
Options exercisable at December 31, 2016 5 years 4 months 17 days  
Aggregate intrinsic value (in thousands)    
Outstanding $ 56,218 $ 18,255
Options vested and expected to vest at December 31, 2016 56,218  
Options exercisable at December 31, 2016 $ 42,482