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Stock-Based Compensation, Stock Option Activity (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Number of Shares [Roll Forward]      
Granted (in shares) 63,800    
Stock Options [Member]      
Number of Shares [Roll Forward]      
Options outstanding, beginning balance (in shares)   1,650,897  
Granted (in shares)   1,722,730  
Exercised (in shares)   (95,737)  
Forfeited (in shares)   (326,038)  
Options outstanding, ending balance (in shares) 2,951,852 2,951,852 1,650,897
Vested and expected to vest (in shares) 2,951,852 2,951,852  
Exercisable (in shares) 1,130,039 1,130,039  
Weighted Average Exercise Price [Roll Forward]      
Options outstanding, beginning balance (in dollars per share)   $ 11.87  
Granted (in dollars per share)   3.34  
Exercised (in dollars per share)   7.24  
Forfeited (in dollars per share)   29.71  
Options outstanding, ending balance (in dollars per share) $ 5.07 5.07 $ 11.87
Vested and expected to vest (in dollars per share) 5.07 5.07  
Exercisable (in dollars per share) $ 7.66 $ 7.66  
Weighted Average Remaining Contractual Life and Aggregate Intrinsic Value [Abstract]      
Options outstanding, weighted average remaining contractual life   7 years 11 months 26 days 7 years 10 days
Granted, weighted average remaining contractual life   9 years 3 months 10 days  
Vested and expected to vest, weighted average remaining contractual life   7 years 11 months 26 days  
Exercisable, weighted average remaining contractual life   5 years 9 months 21 days  
Options outstanding, aggregate intrinsic value   $ 226,731  
Granted, aggregate intrinsic value   8,803,138  
Exercised, aggregate intrinsic value   0  
Forfeited, aggregate intrinsic value   0  
Options outstanding, aggregate intrinsic value $ 29,754,366 29,754,366 $ 226,731
Vested and expected to vest, aggregate intrinsic value 29,754,366 29,754,366  
Exercisable, aggregate intrinsic value 8,914,003 8,914,003  
Unamortized Stock Compensation Expense [Abstract]      
Unamortized stock compensation expense $ 11,300,108 $ 11,300,108  
Period for recognition   2 years 11 months 19 days