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Accrued expenses and other current liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Accrued expenses and other current liabilities |  |
Accrued expenses | $ 13,986 | $ 5,329
Cylinder deposits | 12,307 | 11,338
Lease obligations | 1,378 | 2,702
Other current liabilities | 2,966 | 48
Total | $ 30,637 | $ 19,417

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