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Business Combinations - Pro Forma Financial Information (Details) - ID R&D - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]    
Pro forma revenue $ 121,533 $ 102,880
Pro forma net income (loss) $ 4,977 $ 2,919