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Property and Equipment, Net - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment, Gross		$ 812	$ 711
Accumulated depreciation and amortization		544	522
Property and equipment, net		268	189
Computer Hardware And Software [Member]
Property, Plant and Equipment, Gross		311	218
Accumulated depreciation and amortization		$ 55	55
Computer Hardware And Software [Member] | Minimum [Member]
Estimated Useful Life (in years)		3 years
Computer Hardware And Software [Member] | Maximum [Member]
Estimated Useful Life (in years)		5 years
Equipment [Member]
Estimated Useful Life (in years)		7 years
Property, Plant and Equipment, Gross		$ 151	151
Accumulated depreciation and amortization		$ 150	142
Leasehold Improvements [Member]
Estimated Useful Lives		Term of lease
Property, Plant and Equipment, Gross		$ 339	339
Accumulated depreciation and amortization		$ 339	325
Intangible Asset [Member]
Estimated Useful Lives		Patent term
Property, Plant and Equipment, Gross		$ 11	3
Accumulated depreciation and amortization	[1]
[1] less than $1,000

X

- 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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Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).

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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.

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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.

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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.

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