5. Patents and Licenses (Tables)

6 Months Ended

Jun. 30, 2018

Patents And Licenses Tables

Patents and Licenses

June 30, 2018						December 31, 2017
Weighted Average Original Life (years)		Gross Carrying Amount		Accumulated Amortization		Weighted Average Original Life (years)		Gross Carrying Amount		Accumulated Amortization
	15.67	$	13,840	$	12,122		15.67	$	13,840	$	12,062

Future Amortization Expense

2019	$	119
2020	$	119
2021	$	119
2022	$	117
2023	$	113