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Significant agreements (Details)	1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 31, 2020 patient	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)
Significant agreements
Research and development		$ 49,101,000	$ 28,834,000	$ 89,538,000	$ 58,312,000
Bristol-Myers Squibb Company
Significant agreements
Number of patients | patient	125
Regeneron Pharmaceuticals, Inc | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Significant agreements
Research and development				0	1,100,000
Proceeds from collaborators				$ 0	$ 2,000,000

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Cash received from collaborators during the current period.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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