Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Mar. 31, 2022
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 113,895	$ 112,475
Less: accumulated depreciation and amortization	(69,838)	(62,624)
Property and equipment, net	44,057	49,851
Computer and Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	11,374	10,573
Laboratory Equipment and Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	51,760	51,557
Furniture and Office Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	9,140	8,926
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	40,768	40,566
Capitalized Asset Retirement Obligations
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 853	$ 853

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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