Summary of Significant Accounting Policies - Potentially dilutive securities (Details) - shares	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Potentially dilutive securities
Potentially dilutive securities excluded from computation of diluted weighted average shares	1,584,198	4,612,799
Stock Options
Potentially dilutive securities
Potentially dilutive securities excluded from computation of diluted weighted average shares	1,495,642	552,605
Series A
Potentially dilutive securities
Potentially dilutive securities excluded from computation of diluted weighted average shares		911,336
Series B
Potentially dilutive securities
Potentially dilutive securities excluded from computation of diluted weighted average shares		3,060,302
Series B Redeemable Convertible Preferred Stock Warrants | Warrants
Potentially dilutive securities
Potentially dilutive securities excluded from computation of diluted weighted average shares		88,556
Common Stock Warrants
Potentially dilutive securities
Potentially dilutive securities excluded from computation of diluted weighted average shares	88,556