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Stock Compensation - Summary of Share-based Compensation Arrangements by Share-based Payment Award (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options, Granted 0    
2017 EIP And 2021 EIP [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options, Beginning   1,855,507  
Number of options, Granted   1,188,064  
Number of options, Exercised   (145,805)  
Number of options, Cancelled and forfeited   (3,095)  
Number of options, Ending   2,894,671 1,855,507
Number of options, Options exercisable   82,944  
Number of options, Vested and expected to vest   2,894,671  
Weighted average exercise price, Opening balance   $ 2.99  
Weighted average exercise price, Granted   8.98  
Weighted average exercise price, Exercised   3.77  
Weighted average exercise price, Cancelled and forfeited   9.38  
Weighted average exercise price, Ending balance   5.43 $ 2.99
Weighted average exercise price, Option exercisable   3.42  
Weighted average exercise price, Vested and expected to vest   $ 5.43  
Weighted average remaining contractual term   9 years 4 months 6 days 9 years 9 months 14 days
Weighted average remaining contractual term, Options exercisable   8 years 11 months 15 days  
Weighted average remaining contractual term, Vested and expected to vest   9 years 4 months 6 days  
Intrinsic Value   $ 34,521 $ 8
Intrinsic Value, Options exercisable   1,155  
Intrinsic Value, Vested and expected to vest   $ 34,521