Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2014

Intangible Assets [Abstract]

Summary of intangible assets

	Weighted Average Remaining Amortization Period (years)	Cost		Accumulated  Amortization		Net Book Value
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
December 31, 2013
Licenses	5.7	$	462,234	$	279,258	$	182,976
Patents	2.6		1,893,185		1,443,649		449,536
Total	3.4	$	2,355,419	$	1,722,907	$	632,512

Summary of annual amortization expense

Year	Amortization Expense
2015	$	173,000
2016	$	62,000
2017	$	62,000
2018	$	62,000
2019	$	50,949