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Selected Account Information - Components of Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Sep. 30, 2023
Selected Account Information [Abstract]    
Prepaid insurance $ 9,297 $ 375
Prepaid legal 156 184
Prepaid taxes and licenses 265 486
Prepaid rent 215 346
Other 1,052 552
Total prepaid expenses and other current assets $ 10,985 $ 1,943