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Equity-Based Compensation - Summary of Stock Option Activity (Details) - 2020 Plan
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Number of Options Outstanding    
Outstanding at beginning of period | shares 2,945,297  
Granted | shares 2,962,369  
Exercised | shares (67,623)  
Forfeited | shares (188,318)  
Outstanding at end of period | shares 5,651,725 2,945,297
Exercisable at September 30, 2020 | shares 1,268,030  
Weighted Average Strike Price Per Option    
Outstanding at beginning of period | $ / shares $ 2.03  
Granted | $ / shares 11.20  
Exercised | $ / shares 2.04  
Forfeited | $ / shares 2.69  
Outstanding at end of period | $ / shares 6.81 $ 2.03
Exercisable at September 30, 2020 | $ / shares $ 2.82  
Weighted Average Remaining Contractual Term (in years)    
Outstanding 9 years 3 months 14 days 8 years 11 months 4 days
Exercisable at September 30, 2020 8 years 11 months 15 days  
Aggregate Intrinsic Value    
Outstanding at beginning of period | $ $ 7,798  
Outstanding at end of period | $ 144,110 $ 7,798
Exercisable at September 30, 2020 | $ $ 37,394