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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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