Investment Securities - Summary of Available-For-Sale Investment Securities Held by the Company (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Mar. 31, 2021
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale investment securities, Amortized Cost	$ 349,832	$ 133,393
Available-for-sale investment securities, Gross Unrealized Gains	11	7
Available-for-sale investment securities, Gross Unrealized Losses	(3,630)	(388)
Available-for-sale investment securities, Fair Market Value	346,213	133,012
U.S. Government and Agency Obligations
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale investment securities, Amortized Cost	185,330	54,637
Available-for-sale investment securities, Gross Unrealized Gains	9	0
Available-for-sale investment securities, Gross Unrealized Losses	(1,538)	(180)
Available-for-sale investment securities, Fair Market Value	183,801	54,457
Certificates of Deposit
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale investment securities, Amortized Cost	6,219	5,735
Available-for-sale investment securities, Gross Unrealized Gains	0	1
Available-for-sale investment securities, Gross Unrealized Losses	(75)	(4)
Available-for-sale investment securities, Fair Market Value	6,144	5,732
Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale investment securities, Amortized Cost	151,887	70,600
Available-for-sale investment securities, Gross Unrealized Gains	2	6
Available-for-sale investment securities, Gross Unrealized Losses	(2,013)	(204)
Available-for-sale investment securities, Fair Market Value	149,876	70,402
Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale investment securities, Amortized Cost	3,992
Available-for-sale investment securities, Gross Unrealized Gains	0
Available-for-sale investment securities, Gross Unrealized Losses	0
Available-for-sale investment securities, Fair Market Value	3,992
Asset-backed securities
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale investment securities, Amortized Cost	2,404	2,421
Available-for-sale investment securities, Gross Unrealized Gains	0	0
Available-for-sale investment securities, Gross Unrealized Losses	(4)	0
Available-for-sale investment securities, Fair Market Value	$ 2,400	$ 2,421

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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