Property and Equipment and Intangible Assets (Schedule of Property and Equipment and Intangible Assets) (Details) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 4,670,254	$ 4,281,497
Less: Accumulated depreciation	(3,488,784)	(3,258,299)
Property and equipment, net	1,181,470	1,023,198
Intangible assets	724,407	671,061
Less: Accumulated amortization	(152,021)	(95,652)
Total intangible assets, net	572,386	575,409
Purchased Software [Member]
Property, Plant and Equipment [Line Items]
Intangible assets	616,045	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	3,641,230	3,315,812
Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	698,488	660,626
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 330,536	$ 305,059