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Employee Benefit Plans - Summary of Warrant Activity (Details) - Warrants - $ / shares
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Number of warrants    
Outstanding at beginning of period (in shares) 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
Weighted-average exercise price    
Outstanding at beginning of period (in dollars per share) $ 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
Outstanding at end of period (in dollars per share) $ 0 $ 3.00