Summary of Significant Accounting Policies - Potentially dilutive securities (Details) - shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Potentially dilutive securities
Potentially dilutive securities excluded from computation of diluted weighted average shares	1,908,891	1,571,375
Stock Options
Potentially dilutive securities
Potentially dilutive securities excluded from computation of diluted weighted average shares	1,634,458	1,482,819
Restricted Stock Units
Potentially dilutive securities
Potentially dilutive securities excluded from computation of diluted weighted average shares	185,877
Common Stock Warrants
Potentially dilutive securities
Potentially dilutive securities excluded from computation of diluted weighted average shares	88,556	88,556