Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Mar. 31, 2023
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 23,633		$ 23,633		$ 23,601
Less: accumulated depreciation	(15,776)		(15,776)		(15,711)
Property and equipment, net	7,857		7,857		7,890
Depreciation	300	$ 200	500	$ 300
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	14,079		14,079		11,124
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	883		883		887
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	70		70		75
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	5,095		5,095		5,069
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 3,506		$ 3,506		$ 6,446