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Stock-Based Compensation - Summary of share based compensation expense (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 10,501	$ 8,051	$ 21,154	$ 15,606
Research and development expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	5,182	3,813	10,060	7,419
General and administrative expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 5,319	$ 4,238	$ 11,094	$ 8,187

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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