Assets held for rent - Summary of Assets Held for Rent (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Shippers placed in service	$ 9,550	$ 7,671
Fixed assets held for rent	4,686	4,686
Accumulated depreciation	(6,171)	(4,952)
Subtotal	8,065	7,405
Shippers and related components in production	1,352	1,659
Total	$ 9,417	$ 9,064