Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	$ 1,537		$ 1,537		$ 1,009
Less: accumulated depreciation	(737)		(737)		(616)
Total property and equipment, net	800		800		393
Depreciation	46	$ 100	123	$ 300
Impairment of long-lived assets	0	$ 0	0	$ 0
Computer equipment
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	275		275		276
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	100		100		100
Production manufacturing equipment
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	839		839		624
Construction in progress
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	314		314		0
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	$ 9		$ 9		$ 9