Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Mar. 31, 2024
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 80,722	$ 81,405
Less: accumulated depreciation and amortization	(61,496)	(58,906)
Property and equipment, net	19,226	22,499
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	6,814	7,347
Laboratory equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	34,423	34,539
Furniture and office equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	7,343	7,416
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	31,289	31,250
Capitalized asset retirement obligations
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 853	$ 853