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Goodwill and Intangible Assets - Intangible Assets Balances (Detail) - USD ($) $ in Thousands | 12 Months Ended
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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 |

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