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Income taxes - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Provision for income taxes	$ (1,930)	$ 382	$ 292
Valuation allowance	$ 190,428	$ 127,336
Expiration year	2033
Impact of unrecognized tax benefits on income tax rate if recognized	$ 100
Domestic Tax Authority [Member]
Operating loss carry forwards	664,500
State and Local Jurisdiction [Member]
Operating loss carry forwards	377,100
Research Tax Credit Carryforward [Member] | Domestic Tax Authority [Member]
Tax credit carry forwards	16,900
Research Tax Credit Carryforward [Member] | State and Local Jurisdiction [Member]
Tax credit carry forwards	$ 12,500

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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