Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Mar. 31, 2021
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 111,066	$ 111,212
Less: accumulated depreciation and amortization	(58,817)	(50,328)
Property and equipment, net	52,249	60,884
Computer and Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	10,318	13,252
Laboratory Equipment and Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	50,543	48,636
Furniture and Office Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	8,917	8,803
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	40,435	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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