Income taxes - Schedule of Cash Flow, Supplemental Disclosures (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($)
Operating Loss Carryforwards [Line Items]
Total income taxes paid	$ 1,404
Massachusetts
Operating Loss Carryforwards [Line Items]
U.S. state	0
Other states
Operating Loss Carryforwards [Line Items]
U.S. state	44
Sweden
Operating Loss Carryforwards [Line Items]
Foreign	1,220
Other foreign jurisdictions
Operating Loss Carryforwards [Line Items]
Foreign	$ 140