Net loss per share - Antidilutive (Details) - shares	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023
Net loss per share
Total shares excluded from calculation (in shares)	12,884,584	15,291,430
Employee Stock Option
Net loss per share
Total shares excluded from calculation (in shares)	9,281,739	11,674,491
Restricted stock awards and units
Net loss per share
Total shares excluded from calculation (in shares)	3,602,845	3,616,939

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
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482662/260-10-50-1

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