Selected Balance Sheet Information (Schedule of Property and Equipment) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 3,635	$ 3,293
Less: Accumulated depreciation and amortization	2,025	1,868
Property and equipment, net	1,610	1,425
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	350	271
Lab equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,614	1,565
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	576	556
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 95	88
Capital equipment in process
Property, Plant and Equipment [Line Items]
Property and equipment, gross		$ 813

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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