Net Loss Per Share - Antidilutive securities (Details) - shares	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021
Antidilutive securities
Antidilutive securities excluded from computation (in shares)	4,398,474	3,006,005
Outstanding stock options
Antidilutive securities
Antidilutive securities excluded from computation (in shares)	4,181,702	2,777,399
Unvested restricted stock
Antidilutive securities
Antidilutive securities excluded from computation (in shares)	15,776	27,610
Restricted Stock Units
Antidilutive securities
Antidilutive securities excluded from computation (in shares)	200,996	200,996

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257

Name:	us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration