Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Components of Property and equipment
Property and Equipment, Gross	$ 533	$ 533
Less accumulated depreciation and amortization	(510)	(467)
Property and equipment, net	23	66
Computer equipment [Member]
Components of Property and equipment
Estimated Life	3 years
Property and Equipment, Gross	104	104
Lab equipment [Member]
Components of Property and equipment
Estimated Life	5 years
Property and Equipment, Gross	142	142
Furniture and fixtures [Member]
Components of Property and equipment
Estimated Life	5 years
Property and Equipment, Gross	93	93
Computer software [Member]
Components of Property and equipment
Estimated Life	3 years
Property and Equipment, Gross	176	176
Leasehold improvements [Member]
Components of Property and equipment
Leasehold improvements	Lesser of useful life or life of the lease
Property and Equipment, Gross	$ 18	$ 18

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount of long-lived 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, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived 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, furniture and fixtures, and computer equipment.

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