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Share-Based Compensation - Restricted Common Stock Awards (Details) - Restricted Common Stock
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Shares  
Nonvested outstanding shares beginning balance (in shares) | shares 30,013
Granted (in shares) | shares 31,496
Vested (in shares) | shares (37,085)
Forfeited (in shares) | shares (247)
Nonvested outstanding shares ending balance (in shares) | shares 24,177
Weighted Average Grant-Date Fair Value  
Nonvested outstanding shares beginning balance (in dollars per share) | $ / shares $ 15.60
Granted (in dollars per share) | $ / shares 18.83
Vested (in dollars per share) | $ / shares 15.12
Forfeited (in dollars per share) | $ / shares 20.26
Nonvested outstanding shares ending balance (in dollars per share) | $ / shares $ 20.50