Discontinued operations - Narrative (Details) $ in Thousands		3 Months Ended	6 Months Ended
	Apr. 17, 2024 USD ($) employee	Jun. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)
Discontinued Operations, Disposed of by Sale | Global Cooling
Discontinued Operations [Line Items]
Cash required on closing date, funded by entity	$ 6,652
Repayment of indebtedness	2,600
Other liabilities	$ 2,643
Expected reduction of workforce | employee	47
Expected reduction of workforce (percent)	11.00%
Period of transition services	90 days
Depreciation		$ 100	$ 300
Capital expenditure cost		$ 400	600
Amortization			$ 100
Global Cooling
Discontinued Operations [Line Items]
Cash required on closing date	$ 7,000