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Goodwill and Intangible Assets - Intangible Assets Balances (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount $ 19,650 $ 1,240
Accumulated amortization (1,388) (933)
Net book value $ 18,262 $ 307
Developed Technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Estimated Weighted Average Useful Lives in Years 16 years 6 years
Gross carrying amount $ 19,120 $ 1,220
Accumulated amortization (1,361) (913)
Net book value $ 17,759 $ 307
Tradenames & Trademarks    
Acquired Finite-Lived Intangible Assets [Line Items]    
Estimated Weighted Average Useful Lives in Years 2 years 2 years
Gross carrying amount $ 20 $ 20
Accumulated amortization $ (20) $ (20)
Customer relationships    
Acquired Finite-Lived Intangible Assets [Line Items]    
Estimated Weighted Average Useful Lives in Years 1 year 6 months  
Gross carrying amount $ 510  
Accumulated amortization (7)  
Net book value $ 503