Annual report pursuant to Section 13 and 15(d)

Net Loss Per Share - Antidilutive Securities (Details)

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Net Loss Per Share - Antidilutive Securities (Details) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Employee stock options    
Net Loss Per Share    
Potentially dilutive securities 1,480,139 437,603
Restricted stock subject to forfeiture and restricted stock units    
Net Loss Per Share    
Potentially dilutive securities 241,828 183,796
Common stock warrants    
Net Loss Per Share    
Potentially dilutive securities 758,939 1,290,103