Property and Equipment and Intangible Assets (Detail) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 4,262,800	$ 3,947,536
Less: Accumulated depreciation	(3,105,143)	(2,879,858)
Total property and equipment, net	1,157,657	1,067,679
Less: Accumulated depreciation and amortization	(8,885)	(4,038)
Total intangible assets, net	99,477	44,423
Internally developed software
Property, Plant and Equipment [Line Items]
Internally developed software	108,362	48,461
Laboratory equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,206,292	3,036,274
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	757,073	716,363
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 299,434	$ 194,899

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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