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Stock Options - Summary of Status of Stock Options Exercised, Including Substantive Options (Details)
3 Months Ended
Mar. 31, 2021
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Number of shares Outstanding, Beginning Balance | shares 53,277
Number of shares, Exercised | shares (29,500)
Number of shares Outstanding, Ending Balance | shares 23,777
Weighted Average Exercise Price, Beginning Balance | $ / shares $ 5.87
Weighted Average Exercise Price, Exercised | $ / shares 5.53
Weighted Average Exercise Price, Ending Balance | $ / shares $ 6.29