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Selected Balance Sheet Information (Schedule of Property and Equipment) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | $ 2,755 | $ 2,110
Less: Accumulated depreciation and amortization | 1,812 | 1,700
Property and equipment, net | 943 | 410
Office furniture and equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | 271 | 189
Lab equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | 1,440 | 1,272
Computer equipment and software |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | 516 | 516
Leasehold improvements |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | 45 | 44
Capital equipment in process |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | $ 483 | $ 89

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