Discontinued operations - Components of Loss from Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Discontinued Operations [Line Items]
Loss on disposal			$ (8,897)	$ 0
Loss before income taxes	$ 0	$ (13,328)	(19,572)	(22,999)
Income tax expense	0	0	(10)	(3)
Loss from discontinued operations	0	(13,328)	(19,582)	(23,002)
Discontinued Operations, Disposed of by Sale | Global Cooling
Discontinued Operations [Line Items]
Revenue	0	9,755	7,157	28,546
Cost of revenue	0	10,100	8,389	28,048
Gross profit	0	(345)	(1,232)	498
Operating expenses	0	(5,789)	(9,418)	(16,259)
Asset impairment charges	0	(7,175)	0	(7,175)
Other income (expense), net	0	(19)	(25)	(63)
Loss on disposal	0	0	(8,897)	0
Loss before income taxes	0	(13,328)	(19,572)	(22,999)
Income tax expense	0	0	(10)	(3)
Loss from discontinued operations	$ 0	$ (13,328)	$ (19,582)	$ (23,002)