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v3.23.1

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

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