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Share-Based Compensation - Stock Option Activity (Details)
 3 Months Ended
Mar. 31, 2021
USD ($)
$ / shares
shares
Number of Shares  
Beginning balance (in shares) | shares 45,800
Exercised (in shares) | shares (14,300)
Ending balance (in shares) | shares 31,500
Vested and Expected to Vest (in shares) | shares 31,500
Exercisable (in shares) | shares 31,500
Weighted-Average Exercise Price  
Beginning balance (in dollars per share) | $ / shares $ 15.00
Exercised (in dollars per share) | $ / shares 11.97
Ending balance (in dollars per share) | $ / shares 16.37
Vested and Expected to Vest, Weighted-Average Exercise Price (in dollars per share) | $ / shares 16.37
Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ / shares $ 16.37
Weighted Average Remaining Contractual Term (in Years)  
Outstanding 2 years 21 days
Vested and Expected to Vest 2 years 21 days
Exercisable 2 years 21 days
Aggregate Intrinsic Value  
Outstanding | $ $ 949,155
Vested and Expected to Vest | $ 949,155
Exercisable | $ $ 949,155