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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)