Summary of Significant Accounting Policies - Potentially dilutive securities (Details) - shares	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Potentially dilutive securities
Potentially dilutive securities excluded from computation of diluted weighted average shares	1,961,135	1,584,198
Stock Options
Potentially dilutive securities
Potentially dilutive securities excluded from computation of diluted weighted average shares	1,708,601	1,495,642
Restricted stock units
Potentially dilutive securities
Potentially dilutive securities excluded from computation of diluted weighted average shares	163,978
Common Stock Warrants
Potentially dilutive securities
Potentially dilutive securities excluded from computation of diluted weighted average shares	88,556	88,556