Stock-Based Compensation - Summary of stock option activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
Sep. 30, 2023	Mar. 31, 2023
Number of Stock Options
Number of options, beginning balance (in shares)	11,682,481
Number of options, granted (in shares)	2,080,263
Number of options, exercised (in shares)	(340,329)
Number of options, forfeited (in shares)	(46,432)
Number of options, expired (in shares)	(3,627)
Number of options, ending balance (in shares)	13,372,356	11,682,481
Weighted- Average Exercise Price
Weighted-average exercise price, beginning balance (in dollars per share)	$ 8.05
Weighted-average exercise price, granted (in dollars per share)	15.13
Weighted average exercise price, exercised (in dollars per share)	7.98
Weighted-average exercise price, forfeited (in dollars per share)	9.85
Weighted-average exercise price, expired (in dollars per share)	8.62
Weighted-average exercise price, ending balance (in dollars per share)	$ 9.14	$ 8.05
Additional Disclosures
Remaining contractual term	7 years 11 months 26 days	8 years 1 month 28 days
Aggregate intrinsic value	$ 391,077	$ 88,919
Number of options, exercisable (in shares)	6,648,722
Weighted-average exercise price, exercisable (in dollars per share)	$ 8.14
Remaining contractual term, exercisable	7 years 1 month 2 days
Aggregate intrinsic value, exercisable	$ 201,142

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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