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Employee Benefit Plans - Summary of Warrant Activity (Details) - Warrants - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Number of warrants        
Outstanding at beginning of period (in shares) 261,681 261,681 261,681  
Beginning balance, Outstanding (in shares) 261,681 261,681 261,681 261,681
Granted (in shares) 0 0    
Exercised (in shares) (261,681) 0    
Forfeited (in shares) 0 0    
Outstanding at end of period (in shares) 0 261,681 261,681 261,681
Weighted-average exercise price        
Weighted-average exercise price, beginning balance (in dollars per share) $ 3.00 $ 3.00 $ 3.00 $ 3.00
Granted (in dollars per share) 0 0
Exercised (in dollars per share) 3.00 0
Forfeited (in dollars per share) 0 0
Weighted-average exercise price, ending balance (in dollars per share) $ 0 $ 3.00 $ 3.00 $ 3.00