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Equity-based Compensation and Equity Incentive Plans - Schedule of Stock Option Activity Under 2015 and 2017 Plan (Detail) - 2015 and 2017 Plan - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding Beginning balance, Number of options 3,343,836  
Granted, Number of options 2,215,796  
Exercised, Number of options (139,772)  
Cancelled/Forfeited, Number of options (918,947)  
Outstanding Ending balance, Number of options 4,500,913 3,343,836
Number of options, Vested or expected to vest 4,500,913  
Number of options, Exercisable 2,032,515  
Beginning balance, Weighted-average price $ 6.00  
Granted, Weighted-average price 3.37  
Exercised, Weighted-average price 2.24  
Cancelled/Forfeited, Weighted-average price 4.30  
Ending balance, Weighted-average price 5.17 $ 6.00
Weighted-average price Vested or expected to vest 5.17  
Weighted-average price, Exercisable $ 7.33  
Outstanding, weighted average remaining contractual term (Year) 8 years 2 months 12 days 8 years 4 months 24 days
Weighted average remaining contractual term, Vested or expected to vest 8 years 2 months 12 days  
Weighted average remaining contractual term, Exercisable 7 years 2 months 12 days  
Beginning balance, Aggregate Intrinsic value $ 399  
Exercised, Aggregate Intrinsic value 160  
Ending balance, Aggregate Intrinsic value 588 $ 399
Aggregate Intrinsic value, Vested or expected to vest at December 31, 2021 588  
Aggregate Intrinsic value, Exercisable at December 31, 2021 $ 258