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Income taxes - Schedule of deferred tax assets and liabilities (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Income taxes |  |
Net operating loss carryforwards | $ 163,782 | $ 112,434
Research and development credit carryforwards | 20,163 | 9,407
Operating lease liability | 14,890 | 7,506
Other | 11,631 | 5,639
Gross deferred tax assets | 210,466 | 134,986
Less: Valuation allowance | (190,428) | (127,336)
Net deferred tax assets | 20,038 | 7,650
Fixed assets | (785) | (105)
Operating lease right-of-use asset | (14,893) | (7,498)
Intangible assets | (4,360) | (47)
Gross deferred tax liabilities | $ (20,038) | $ (7,650)

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