4. Patents (Tables)

9 Months Ended

Sep. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of annual amortization expense

For the years ending December 31,
(In thousands)
Remainder of 2019	$	857
2020		2,555
2021		1,695
2022		1,695
2023		1,620
Thereafter		249
	$	8,671