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Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Prepaid expenses and other current assets    
Prepaid insurance $ 712 $ 990
Prepaid supplier expenses 232 286
Other receivables $ 103 254
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration] Total prepaid expenses and other current assets  
Natural gas derivatives at fair value, current $ 138 347
Deposits 203 236
Other 14 73
Total prepaid expenses and other current assets $ 1,402 $ 2,186