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Net Loss Per Share - Potential shares excluded from calculation (Details) - shares
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Stock Options    
Net Loss Per Share    
Antidilutive securities excluded from computation of earnings per share 1,607,941 1,107,598
Warrants    
Net Loss Per Share    
Antidilutive securities excluded from computation of earnings per share 2,400 5,000