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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, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Outstanding at December 31, 2015 (in shares) 4,192,122  
Granted (in shares) 91,052  
Canceled and forfeited (in shares) (169,049)  
Exercised (in shares) (1,483,602)  
Outstanding at December 31, 2016 (in shares) 2,630,523 4,192,122
Options vested and expected to vest at December 31, 2016 (in shares) 2,630,523  
Options exercisable at December 31, 2016 (in shares) 1,901,861  
Weighted- average exercise price per share    
Outstanding at December 31, 2015 (in dollars per share) $ 14.42  
Granted (in dollars per share) 26.06  
Canceled and forfeited (in dollars per share) 16.55  
Exercised (in dollars per share) 12.64  
Outstanding at December 31, 2016 (in dollars per share) 15.68 $ 14.42
Options vested and expected to vest at December 31, 2016 (in dollars per share) 15.68  
Options exercisable at December 31, 2016 (in dollars per share) $ 14.13  
Weighted- average remaining contractual term (in years)    
Outstanding 5 years 10 months 2 days 6 years 5 months 19 days
Options vested and expected to vest as December 31, 2016 5 years 10 months 2 days  
Options exercisable at December 31, 2016 5 years 7 days  
Aggregate intrinsic value (in thousands)    
Outstanding $ 134,670 $ 56,218
Options vested and expected to vest at December 31, 2016 134,670  
Options exercisable at December 31, 2016 $ 34,348