Net Loss Per Share - Antidilutive Securities Excluded from Computation of Net Loss per Share (Details) - shares	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Securities excluded from computation of diluted net loss per share
Anti-dilutive securities excluded from calculation of diluted net loss per share	8,539,131	8,667,265
Options to purchase common shares
Securities excluded from computation of diluted net loss per share
Anti-dilutive securities excluded from calculation of diluted net loss per share	7,946,120	8,560,514
Warrants to purchase common shares
Securities excluded from computation of diluted net loss per share
Anti-dilutive securities excluded from calculation of diluted net loss per share	106,751	106,751
Restricted stock units
Securities excluded from computation of diluted net loss per share
Anti-dilutive securities excluded from calculation of diluted net loss per share	486,260	0