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Net Loss Per Share - Antidilutive Securities Excluded From Computation of Earnings Per Share (Details) - shares
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Net loss Per Share    
Antidilutive securities excluded from computation of earnings per share 1,406,586 1,476,676
Common stock options    
Net loss Per Share    
Antidilutive securities excluded from computation of earnings per share 1,101,500 1,071,148
Performance stock units    
Net loss Per Share    
Antidilutive securities excluded from computation of earnings per share 62,041 123,212
Restricted Stock Units    
Net loss Per Share    
Antidilutive securities excluded from computation of earnings per share 201,767 237,709
Employee stock purchase plan    
Net loss Per Share    
Antidilutive securities excluded from computation of earnings per share 41,278 44,607