Equipment (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Summary of equipment
Less accumulated depreciation	$ (1,531,090)	$ (2,138,075)
Equipment, net	2,835,707	3,288,108
Office and laboratory equipment [Member]
Summary of equipment
Office and laboratory equipment	$ 4,366,797	$ 5,426,183

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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