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Summary of Significant Accounting Policies - Selling, general and administrative costs (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Accounting Policy [Line Items]            
Rent expense and other facilities costs           $ 2,005,583
Stock based compensation $ 997,979 $ 105,341 $ 1,913,096 $ 1,789 $ 122,032 392,566
Total 16,931,866 6,301,712 37,477,055 17,870,603 28,351,709 22,012,162
Selling, general and administrative costs            
Accounting Policy [Line Items]            
Compensation and benefits         16,696,017 13,094,579
Rent expense and other facilities costs         7,132,472 5,801,044
Professional fees and consultants         3,211,270 2,789,069
Legal settlement         1,125,000  
Stock based compensation $ 868,515 $ 100,960 $ 1,566,580 $ 71,847 186,950 327,470
Total         $ 28,351,709 $ 22,012,162