Property and Equipment (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property and equipment
Property and equipment, gross	$ 7,781,155	$ 7,681,483
Less: Accumulated depreciation and amortization	(6,909,587)	(6,444,639)
Total	871,568	1,236,844
Depreciation and amortization expense on property and equipment	535,000	399,000	258,000
Computer equipment
Property and equipment
Property and equipment, gross	4,274,386	4,197,051
Furniture, fixtures and improvements
Property and equipment
Property and equipment, gross	822,290	879,626
Computer software
Property and equipment
Property and equipment, gross	$ 2,684,479	$ 2,604,806

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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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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- Definition

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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