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Income Taxes - CarryForwards (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Reconciliation of unrecognized tax benefits      
Beginning balance $ 123 $ 273 $ 0
Additions based on positions related to the current year 20 0 0
Additions for tax positions of prior years 0 0 273
Reductions for tax positions of prior years 0 (150) 0
Settlements 0 0 0
Ending balance $ 143 $ 123 $ 273