Property and Equipment and Intangible Assets (Schedule of Property and Equipment and Intangible Assets) (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 4,281,497	$ 3,856,032
Less: Accumulated depreciation	(3,258,299)	(2,810,745)
Total property and equipment, net	1,023,198	1,045,287
Intangible assets	671,061	139,966
Less: Accumulated amortization	(95,652)	(73,151)
Total intangible assets, net	575,409	66,815
Purchased Software [Member]
Property, Plant and Equipment [Line Items]
Intangible assets	562,699	91,505
Internally Developed Software [Member]
Property, Plant and Equipment [Line Items]
Intangible assets	108,362	48,461
Laboratory Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,315,812	3,036,274
Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	660,626	624,859
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 305,059	$ 194,899