Property and Equipment and Intangible Assets (Schedule of Property and Equipment and Intangible Assets) (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 4,362,911	$ 4,281,497
Less: Accumulated depreciation	(3,371,013)	(3,258,299)
Total property and equipment, net	991,898	1,023,198
Intangible assets	675,461	671,061
Less: Accumulated amortization	(120,337)	(95,652)
Total intangible assets, net	555,124	575,409
Purchased Software [Member]
Property, Plant and Equipment [Line Items]
Intangible assets	567,099	562,699
Internally Developed Software [Member]
Property, Plant and Equipment [Line Items]
Intangible assets	108,362	108,362
Laboratory Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,379,883	3,315,812
Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	675,219	660,626
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 307,809	$ 305,059