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Net Loss Per Share - Potential shares excluded from calculation (Details) - shares
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Stock Options    
Net Loss Per Share    
Antidilutive securities excluded from computation of earnings per share 961,653 903,847
Warrants    
Net Loss Per Share    
Antidilutive securities excluded from computation of earnings per share 2,400 100,000