Assets held for rent - Schedule of Assets Held for Rent (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Shippers placed in service	$ 9,709	$ 9,866
Fixed assets held for rent	579	1,468
Accumulated depreciation	(6,080)	(6,272)
Subtotal	4,208	5,062
Shippers and related components in production	2,696	2,651
Total	$ 6,904	$ 7,713