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Prepaid and Other Current Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Prepaid Expense and Other Assets, Current [Abstract]    
Prepaid insurance $ 911 $ 805
Interest receivable 514 1,530
Prepaid engineering 0 409
Prepaid feedstock, current 1,097 0
Prepaid other 512 863
Total Prepaid and other current assets $ 3,034 $ 3,607