Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2015

Intangible Assets [Abstract]

Summary of intangible assets

	Weighted Average  Remaining Amortization  Period (years)	Cost		Accumulated Amortization		Net Book Value
March 31, 2015
Licenses	4.5	$	462,234	$	313,211	$	149,023
Patents	1.7		1,893,185		1,686,298		206,887
Total	2.4	$	2,355,419	$	1,999,509	$	355,910
December 31, 2014
Licenses	4.7	$	462,234	$	306,495	$	155,739
Patents	1.9		1,893,185		1,638,975		254,210
Total	2.6	$	2,355,419		$ 1, 945,470	$	409,949

Summary of annual amortization expense

	Amortization Expense
April 1 through  December 31, 2015	$	162,100
2016	$	81,900
2017	$	37,300
2018	$	37,300
2019	$	37,300