Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Mar. 31, 2025
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 39,079	$ 39,197
Less: accumulated depreciation and amortization	(38,097)	(37,939)
Property and equipment, net	982	1,258
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,682	2,713
Laboratory equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	34,653	34,681
Furniture and office equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	782	836
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 962	$ 967

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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