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Net Loss Per Share - Potential shares excluded from calculation (Details) - shares
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Stock Options    
Net Loss Per Share    
Antidilutive securities excluded from computation of earnings per share 1,107,598 324,996
Warrants    
Net Loss Per Share    
Antidilutive securities excluded from computation of earnings per share 5,000 100,000