Net Loss Per Common Share (Details) - shares	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Net (Loss) Income Per Common Share
Total potential dilutive shares (in shares)	13,098,695	4,886,260
Common shares under option
Net (Loss) Income Per Common Share
Total potential dilutive shares (in shares)	3,703,938	4,428,650
Unvested RSUs
Net (Loss) Income Per Common Share
Total potential dilutive shares (in shares)	879,349	457,610
Unvested PBRSUs
Net (Loss) Income Per Common Share
Total potential dilutive shares (in shares)	45,300	0
Shares issuable related to the ESPP
Net (Loss) Income Per Common Share
Total potential dilutive shares (in shares)	9,871	0
Shares issuable upon conversion of convertible notes
Net (Loss) Income Per Common Share
Total potential dilutive shares (in shares)	8,460,237	0