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Selected Balance Sheet Information (Schedule of Property and Equipment) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 4,382	$ 3,978
Less: Accumulated depreciation and amortization	2,659	2,280
Property and equipment, net	$ 1,723	1,698
Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	5 years
Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 402	350
Lab equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,685	2,684
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	772	618
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	98	95
Capital equipment in process
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 425	$ 231

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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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