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Net Loss per Share - Anti-dilutive (Details) - shares
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Potentially dilutive securities    
Anti-dilutive common stock equivalent shares 5,153,301 4,634,353
Restricted Stock    
Potentially dilutive securities    
Anti-dilutive common stock equivalent shares 1,233,218 798,034
Stock options    
Potentially dilutive securities    
Anti-dilutive common stock equivalent shares 3,920,083 3,836,319