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Stock-Based Compensation - Schedule of Common Stock Option Activity (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 [Line Items]    
Number of Shares, Beginning Balance 3,509,829  
Number of Shares, Granted 1,809,566  
Number of Shares, Exercised (294,310)  
Number of Shares, Forfeited (336,952)  
Number of Shares, Ending Balance 4,688,133 3,509,829
Number of Shares, Options vested and expected to vest as of December 31, 2019 4,688,133  
Number of Shares, Options exercisable as of December 31, 2019 1,411,435  
Weighted-Average Exercise Price, Outstanding, Beginning balance $ 8.67  
Weighted-Average Exercise Price, Granted 8.86  
Weighted-Average Exercise Price, Exercised 6.87  
Weighted-Average Exercise Price, Forfeited 8.24  
Weighted-Average Exercise Price, Outstanding, Ending balance 8.88 $ 8.67
Weighted-Average Exercise Price, Options vested and expected to vest as of December 31, 2019 8.88  
Weighted-Average Exercise Price, Options exercisable as of December 31, 2019 $ 8.56  
Weighted Average Remaining Contractual Term 8 years 7 months 6 days 9 years 2 months 12 days
Weighted Average Remaining Contractual Term, Options vested and expected to vest as of December 31, 2019 8 years 7 months 6 days  
Weighted Average Remaining Contractual Term, Options exercisable as of December 31, 2019 8 years 3 months 18 days  
Aggregate Intrinsic Value, Beginning Balance $ 526  
Aggregate Intrinsic Value, Ending Balance 29,634 $ 526
Aggregate Intrinsic Value, Options vested and expected to vest as of December 31, 2019 29,634  
Aggregate Intrinsic Value, Options exercisable as of December 31, 2019 $ 9,316