PROPERTY AND EQUIPMENT (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
PROPERTY AND EQUIPMENT
Property and equipment, gross	$ 13,451	$ 18,539
Less accumulated depreciation and amortization	(12,477)	(17,298)
Property and equipment, net	974	1,241
Furniture and computer equipment
PROPERTY AND EQUIPMENT
Property and equipment, gross	2,816	2,748
Lab equipment
PROPERTY AND EQUIPMENT
Property and equipment, gross	7,731	9,676
Leasehold improvements
PROPERTY AND EQUIPMENT
Property and equipment, gross	$ 2,904	$ 6,115

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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