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Net Loss per Share - Anti-dilutive (Details) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Anti-dilutive securities    
Anti-dilutive securities excluded from the calculation of net loss per share 3,737,900 2,711,356
Restricted common stock    
Anti-dilutive securities    
Anti-dilutive securities excluded from the calculation of net loss per share 57,969 302,360
Warrant    
Anti-dilutive securities    
Anti-dilutive securities excluded from the calculation of net loss per share   7,614
Stock options    
Anti-dilutive securities    
Anti-dilutive securities excluded from the calculation of net loss per share 3,679,931 2,401,382