Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2012

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of intangible assets

	Weighted Average Amortization Period (years)		Cost		Accumulated Amortization		Net Book Value
June 30, 2012
Licenses		8.2	$	462,234	$	238,288	$	223,946
Patents		3.1		1,893,185		1,142,754		750,431
Total		4.1	$	2,355,419	$	1,381,042	$	974,377
December 31, 2011
Licenses		8.7	$	462,234	$	224,708	$	237,526
Patents		3.3		1,893,185		1,051,145		842,040
Total		4.4	$	2,355,419	$	1,275,853	$	1,079,566

Annual amortization expense

	Amortization Expense
2012	$	222,800
2013	$	222,800
2014	$	222,800
2015	$	222,800
2016	$	83,200