Balance Sheet Components - Schedule of Property And Equipment, Net (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 111,212	$ 112,165
Less: accumulated depreciation and amortization	(50,328)	(34,283)
Property and equipment, net	60,884	77,882
Computer And Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	13,252	13,364
Laboratory Equipment And Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	48,636	49,367
Furniture And Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	8,803	8,868
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	39,668	39,713
Capitalized Asset Retirement Obligations [Member]
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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