Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Dec. 31, 2012
Components of Property and equipment
Property and Equipment, Gross	$ 508	$ 533
Less accumulated depreciation and amortization	(486)	(510)
Property and equipment, net	22	23
Computer equipment
Components of Property and equipment
Estimated Life	3 years
Property and Equipment, Gross	87	104
Lab equipment
Components of Property and equipment
Estimated Life	5 years
Property and Equipment, Gross	142	142
Furniture and fixtures
Components of Property and equipment
Estimated Life	5 years
Property and Equipment, Gross	85	93
Computer software
Components of Property and equipment
Estimated Life	3 years
Property and Equipment, Gross	176	176
Leasehold improvements
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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