Intangible Assets (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2018

Dec. 31, 2017

Intangible Assets [Abstract]

Summary of intangible assets

	Cost		Accumulated Amortization		Net Book Value
March 31, 2018
Licenses	$	462,234	$	394,998	$	67,236
Patents		1,893,185		1,893,185		-
Total	$	2,355,419	$	2,288,183	$	67,236
December 31, 2017
Licenses	$	462,234	$	388,282	$	73,952
Patents		1,893,185		1,893,185		-
Total	$	2,355,419	$	2,281,467	$	73,952

	Cost		Accumulated Amortization		Net Book Value
December 31, 2017
Licenses	$	462,234	$	388,282	$	73,952
Patents		1,893,185		1,893,185		-
Total	$	2,355,419	$	2,281,467	$	73,952
December 31, 2016
Licenses	$	462,234	$	361,044	$	101,190
Patents		1,893,185		1,867,747		25,438
Total	$	2,355,419	$	2,228,791	$	126,628

Summary of future annual amortization expense

	Amortization Expense
April 1 through December 31, 2018	$	30,584
2019	$	36,652

Year	Amortization Expense
2018	$	37,300
2019	$	36,652