Note 4 - Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Property and equipment, gross	$ 4,914	$ 4,858
Less: Accumulated depreciation and amortization	(2,953)	(2,396)
Property and equipment, net	1,961	2,462
Leasehold Improvements [Member]
Property and equipment, gross	2,519	2,519
Laboratory Equipment [Member]
Property and equipment, gross	1,118	1,019
Furniture and Fixtures [Member]
Property and equipment, gross	966	932
Software and Software Development Costs [Member]
Property and equipment, gross	289	202
Construction in Progress [Member]
Property and equipment, gross	$ 22	$ 186

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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