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Property, Plant and Equipment (Schedule of Property and Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Property, plant and equipment
Property, plant and equipment, gross	$ 6,280	$ 6,156
Less: accumulated depreciation and amortization	(6,253)	(6,120)
Property, Plant and Equipment, Net	27	36
Leasehold Improvements [Member]
Property, plant and equipment
Property, plant and equipment, gross	$ 824	807
Leasehold Improvements [Member] | Minimum [Member]
Property, plant and equipment
Lives in years	5 years
Leasehold Improvements [Member] | Maximum [Member]
Property, plant and equipment
Lives in years	15 years
Research and Laboratory Equipment [Member]
Property, plant and equipment
Property, plant and equipment, gross	$ 4,287	4,209
Research and Laboratory Equipment [Member] | Minimum [Member]
Property, plant and equipment
Lives in years	3 years
Research and Laboratory Equipment [Member] | Maximum [Member]
Property, plant and equipment
Lives in years	5 years
Office Equipment and Furniture [Member]
Property, plant and equipment
Property, plant and equipment, gross	$ 1,169	$ 1,140
Office Equipment and Furniture [Member] | Minimum [Member]
Property, plant and equipment
Lives in years	3 years
Office Equipment and Furniture [Member] | Maximum [Member]
Property, plant and equipment
Lives in years	5 years

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
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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.

+ References

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

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