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Property and Equipment, Net - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment, Gross	$ 539	$ 539
Accumulated depreciation and amortization	466	400
Property and equipment, net	73	139
Computer Hardware And Software [Member]
Property, Plant and Equipment, Gross	55	55
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	$ 145	145
Accumulated depreciation and amortization	$ 120	96
Leasehold Improvements [Member]
Estimated Useful Lives	Term of lease
Property, Plant and Equipment, Gross	$ 339	339
Accumulated depreciation and amortization	$ 291	$ 249

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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- Definition

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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