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Accrued expenses and other current liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Accrued expenses and other current liabilities |  |
Accrued expenses | $ 13,788 | $ 12,320
Cylinder deposits | 20,476 | 19,426
Lease obligations | 2,001 | 1,961
Other current liabilities | 123 | 106
Total | $ 36,388 | $ 33,813

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