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Net Loss per Share - Anti-Dilutive Awards Excluded from Calculation (Details) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Anti-dilutive Securities Excluded from Calculation of Earnings Per Share    
Weighted average number of securities excluded from calculation 292,933 515,530
Stock options    
Anti-dilutive Securities Excluded from Calculation of Earnings Per Share    
Weighted average number of securities excluded from calculation   50,580
Restricted stock units    
Anti-dilutive Securities Excluded from Calculation of Earnings Per Share    
Weighted average number of securities excluded from calculation 292,933 456,817
Restricted stock awards    
Anti-dilutive Securities Excluded from Calculation of Earnings Per Share    
Weighted average number of securities excluded from calculation   8,133