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Selected Account Information - Components of Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Sep. 30, 2021
Selected Account Information [Abstract]    
Prepaid insurance $ 4,712 $ 277
Prepaid legal 25 112
Prepaid taxes and licenses 565 380
Prepaid rent 471 309
Other 1,107 850
Total prepaid expenses and other current assets $ 6,880 $ 1,928