Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2014

Intangible Assets [Abstract]

Summary of intangible assets

	Weighted Average Remaining AmortizationPeriod (years)		Cost		Accumulated Amortization		Net Book Value
March 31, 2014
Licenses		6.5	$	462,234	$	285,974	$	176,260
Patents		2.4		1,893,185		1,491,645		401,540
Total		3.2	$	2,355,419	$	1,777,619	$	577,800
December 31, 2013
Licenses		6.72	$	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

	Amortization Expense
April 1 through December 31,2014	$	168,100
2015	$	172,500
2016	$	61,800
2017	$	61,800
2018	$	20,800