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Stock-Based Compensation - Schedule of Stock Option Activity (Details) - Stock Options
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Outstanding. Stock Options, Beginning Balance | shares 674,842  
Options granted, Stock Options | shares 3,001,750  
Options cancelled or forfeited, Stock Options | shares (159,600)  
Outstanding. Stock Options, Ending Balance | shares 3,516,992 674,842
Vested and expected to vest at September 30, 2021, Stock Options | shares 3,516,992  
Options exercisable at September 30, 2021, Stock Options | shares 84,349  
Outstanding, Weighted Average Exercise Price, Beginning balance | $ / shares $ 20.68  
Options granted, Weighted Average Exercise Price | $ / shares 25.46  
Options cancelled or forfeited, Weighted Average Exercise Price | $ / shares 27.14  
Outstanding, Weighted Average Exercise Price, Ending balance | $ / shares 24.47 $ 20.68
Vested and expected to vest at September 30, 2021, Weighted Average Exercise Price | $ / shares 24.47  
Options exercisable at September 30, 2021, Weighted Average Exercise Price | $ / shares $ 20.08  
Outstanding, Weighted Average Remaining Contractual Life 9 years 4 months 24 days 9 years 9 months 18 days
Vested and expected to vest at September 30, 2021, Weighted Average Remaining Contractual Life 9 years 4 months 24 days  
Options exercisable at September 30, 2021, Weighted Average Remaining Contractual Life 9 years  
Outstanding, Aggregate Intrinsic Value, Beginning Balance | $ $ 3,953  
Outstanding, Aggregate Intrinsic Value, Ending Balance | $ 175 $ 3,953
Vested and expected to vest at September 30, 2021, Aggregate Intrinsic Value | $ 175  
Options exercisable at September 30, 2021, Aggregate Intrinsic Value | $ $ 17