Property and Equipment, Net (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Dec. 31, 2012
Property and Equipment
Property and Equipment, gross	$ 10,655	$ 11,042
Less - accumulated depreciation	(7,985)	(7,745)
Property and equipment, net	2,670	3,297
Accelerated depreciation expense of leasehold improvements and furniture and fixtures associated with a portion of principal executive offices	300
Buildings and improvements
Property and Equipment
Property and Equipment, gross	5,326	5,373
Laboratory and production equipment
Property and Equipment
Property and Equipment, gross	343	115
Furniture and fixtures
Property and Equipment
Property and Equipment, gross	4,963	5,326
Construction in process
Property and Equipment
Property and Equipment, gross	$ 23	$ 228

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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