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Accrued expenses and other current liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Accrued expenses and other current liabilities |  |
Accrued expenses | $ 12,256 | $ 11,696
Cylinder deposits | 17,225 | 13,638
Lease obligations | $ 1,893 | $ 1,669
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Total | Total
Other current liabilities | $ 163 | $ 905
Total | $ 31,537 | $ 27,908

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