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Property and Equipment (Schedule of Property and Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Property, plant and equipment
Property, plant and equipment, gross	$ 425	$ 991
Less: accumulated depreciation and amortization	(361)	(886)
Property, Plant and Equipment, Net	64	106
Leasehold improvements
Property, plant and equipment
Property, plant and equipment, gross	$ 6	409
Leasehold improvements | Minimum
Property, plant and equipment
Lives in years	2 years
Leasehold improvements | Maximum
Property, plant and equipment
Lives in years	15 years
Research and laboratory equipment
Property, plant and equipment
Property, plant and equipment, gross	$ 65	0
Research and laboratory equipment | Minimum
Property, plant and equipment
Lives in years	3 years
Research and laboratory equipment | Maximum
Property, plant and equipment
Lives in years	5 years
Office equipment and furniture
Property, plant and equipment
Property, plant and equipment, gross	$ 353	$ 582
Office equipment and furniture | Minimum
Property, plant and equipment
Lives in years	3 years
Office equipment and furniture | Maximum
Property, plant and equipment
Lives in years	5 years

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- Definition

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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