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Stock-Based Compensation - Stock Option Activity (Details)
12 Months Ended
Dec. 31, 2021
$ / shares
shares
Options  
Outstanding, beginning of year (in shares) | shares 9,500
Stock options exercised (in shares) | shares 4,750
Stock options canceled (in shares) | shares 3,250
Outstanding, end of year (in shares) | shares 1,500
Exercisable, end of year (in shares) | shares 1,500
Weighted Average Exercise Price  
Outstanding, beginning of year (in usd per share) | $ / shares $ 0.56
Stock options exercised (in usd per share) | $ / shares 0.56
Stock options canceled (in usd per share) | $ / shares 0.56
Outstanding, end of year (in usd per share) | $ / shares 0.56
Exercisable, end of year (in usd per share) | $ / shares $ 0.56