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Stockholders' Equity - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares, Beginning balance 5,350,800  
Granted 2,101,750  
Exercised 0  
Expired/Forfeited (320,600)  
Number of Shares, Ending balance 7,131,950 5,350,800
Exercisable as of September 30, 2021 1,178,800  
Weighted Average Exercise Price, Beginning balance $ 1.69  
Granted 8.11  
Exercised 0  
Expired/Forfeited 3.27  
Weighted Average Exercise Price, Ending balance 3.50 $ 1.69
Exercisable as of September 30, 2021 $ 0.60  
Weighted Average Contractual Life Remaining (in years), Outstanding 7 years 8 months 1 day 7 years 9 months
Weighted Average Contractual Life Remaining (in years), Exercisable 5 years 5 months 26 days  
Aggregate Intrinsic Value, Beginning balance $ 41,442,250  
Aggregate Intrinsic Value, Ending balance 87,034,525 $ 41,442,250
Exercisable as of September 30, 2021 $ 17,747,150