Assets held for rent - Summary of Assets Held for Rent (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Shippers placed in service	$ 9,848	$ 7,671
Fixed assets held for rent	1,562	4,686
Accumulated depreciation	(5,778)	(4,952)
Subtotal	5,632	7,405
Shippers and related components in production	1,577	1,659
Total	$ 7,209	$ 9,064