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Net Loss per Share - Anti-dilutive (Details) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Potentially dilutive securities    
Anti-dilutive common stock equivalent shares 4,811,947 4,939,699
Restricted Stock    
Potentially dilutive securities    
Anti-dilutive common stock equivalent shares 507,450 581,408
Stock options    
Potentially dilutive securities    
Anti-dilutive common stock equivalent shares 3,912,257 4,358,291
Convertible notes    
Potentially dilutive securities    
Anti-dilutive common stock equivalent shares 392,240