Accrued expenses and other current liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Accrued expenses and other current liabilities
Accrued expenses	$ 11,696	$ 13,986
Cylinder deposits	13,638	12,307
Lease obligations	$ 1,669	$ 1,378
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Total	Total
Other current liabilities	$ 905	$ 2,966
Total	$ 27,908	$ 30,637