Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 110,082	$ 113,924
Less: accumulated depreciation and amortization	(81,731)	(75,316)
Property and equipment, net	28,351	38,608
Computer equipment and software
Property Plant And Equipment [Line Items]
Property and equipment, gross	7,485	10,376
Laboratory equipment and software
Property Plant And Equipment [Line Items]
Property and equipment, gross	51,635	52,785
Furniture and office equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	8,929	8,946
Leasehold improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	41,180	40,964
Capitalized asset retirement obligations
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 853	$ 853