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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

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