Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Mar. 31, 2021
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 110,155	$ 111,212
Less: accumulated depreciation and amortization	(56,406)	(50,328)
Property and equipment, net	53,749	60,884
Computer and Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	11,218	13,252
Laboratory Equipment and Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	49,464	48,636
Furniture and Office Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	8,803	8,803
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	39,817	39,668
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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