Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2012

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of intangible assets

	Weighted Average Amortization Period (years)		Cost		Accumulated Amortization		Net Book Value
September 30, 2012
Licenses		8.0	$	462,234	$	245,154	$	217,080
Patents		2.9		1,893,185		1,198,272		694,913
Total		3.9	$	2,355,419	$	1,443,426	$	911,993
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	$	223,200
2013	$	223,200
2014	$	221,900
2015	$	174,000
2016	$	61,800