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Stock-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Options, Outstanding 4,450,517 4,004,422  
Number of Options, Granted 1,377,850    
Number of Options, Exercised (55,852)    
Number of Options, Expired (175,971)    
Number of Options, Forfeited (127,151)    
Number of Options, Outstanding 5,469,393 4,450,517 4,004,422
Number of Options, Outstanding, Weighted average remaining contractual life as of December 31, 2020 7 years 3 months 3 days    
Number of Options, Options exercisable 3,192,128    
Number of Options, Exercisable, Weighted average remaining contractual life as of December 31, 2020 6 years 2 months 23 days    
Number of Options, Options vested and expected to vest at December 31, 2020 5,469,393    
Number of Options, Vested and expected to vest, Weighted average remaining contractual life as of December 31, 2020 7 years 3 months 3 days    
Weighted-Average Exercise Price, Outstanding $ 14.73    
Weighted-Average Exercise Price, Granted 15.88    
Weighted-Average Exercise Price, Exercised 12.37    
Weighted-Average Exercise Price, Expired 14.06    
Weighted-Average Exercise Price, Forfeited 16.55    
Weighted-Average Exercise Price, Outstanding 15.02 $ 14.73  
Weighted-Average Exercise Price, Options exercisable, December 31, 2020 13.96    
Weighted-Average Exercise Price, Options vested and expected to vest at December 31, 2020 $ 15.02    
Aggregate Intrinsic Value, Outstanding at December 31, 2020 $ 8,441    
Aggregate Intrinsic Value, Options exercisable at December 31, 2020 7,589    
Aggregate Intrinsic Value, Options vested and expected to vest at December 31, 2020 8,441    
Fair value of options vested 12,819 $ 10,074 $ 9,023
Intrinsic value of options exercised $ 152 $ 5,741 $ 3,893