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Accrued expenses and other current liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Accrued expenses and other current liabilities |  |
Accrued expenses | $ 11,703 | $ 12,256
Cylinder deposits | 17,807 | 17,225
Lease obligations | 1,778 | 1,893
Other current liabilities | 140 | 163
Total | $ 31,428 | $ 31,537

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