Intangible Assets (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2013

Dec. 31, 2012

Intangible Assets [Abstract]

Summary of intangible assets

	Weighted Average Remaining Amortization Period (years)	Cost		Accumulated Amortization		Net Book Value
March 31, 2013
Licenses	7.5	$	462,234	$	258,737	$	203,497
Patents	3.2		1,893,185		1,295,997		597,188
Total	4.0	$	2,355,419	$	1,554,734	$	800,685
December 31, 2012
Licenses	7.7	$	462,234	$	252,019	$	210,215
Patents	3.3		1,893,185		1,247,672		645,513
Total	4.2	$	2,355,419	$	1,499,691	$	855,728

	Weighted Average Amortization period (years)	Cost		Accumulated Amortization		Net Book Value
December 31, 2012
Licenses	7.72	$	462,234	$	252,019	$	210,215
Patents	3.3		1,893,185		1,247,672		645,513
Total	4.2	$	2,355,419	$	1,499,691	$	855,728
December 31, 2011
Licenses	8.72	$	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
2013	$	222,800
2014	$	222,800
2015	$	133,000
2016	$	61,800
2017	$	20,800

Year	Amortization Expense
2013	$	222,800
2014	$	222,800
2015	$	173,800
2016	$	61,800
2017	$	20,800