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Net Loss Per Common Share - Antidilutive Securities (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Redeemable preferred stock        
Potential common shares        
Potential common shares   8,264,613   8,264,613
Convertible notes        
Potential common shares        
Potential common shares   1,547,491   1,547,491
Stock options        
Potential common shares        
Potential common shares 920,355 960,204 920,355 960,204
Warrants        
Potential common shares        
Potential common shares 78,055   78,055