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Accrued expenses and other current liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Accrued expenses and other current liabilities    
Accrued expenses $ 9,558 $ 12,256
Cylinder deposits 18,634 17,225
Lease obligations 1,628 1,893
Other current liabilities 100 163
Total $ 29,920 $ 31,537