Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Gross Carrying Amount	$ 5,067	$ 5,053
Accumulated Amortization	(3,900)	(3,768)
Finite-Lived Intangible Assets, Net	1,167	1,285
Patent [Member]
Gross Carrying Amount	740	728
Accumulated Amortization	(348)	(336)
Finite-Lived Intangible Assets, Net	$ 392	392
Patent [Member] \| Minimum [Member]
Finite-Lived Intangible Asset, Useful Life	1 year
Patent [Member] \| Maximum [Member]
Finite-Lived Intangible Asset, Useful Life	17 years
Software [Member]
Finite-Lived Intangible Asset, Useful Life	3 years
Gross Carrying Amount	$ 412	410
Accumulated Amortization	(406)	(403)
Finite-Lived Intangible Assets, Net	$ 6	7
Customer Relationships [Member]
Finite-Lived Intangible Asset, Useful Life	10 years
Gross Carrying Amount	$ 3,370	3,370
Accumulated Amortization	(2,601)	(2,491)
Finite-Lived Intangible Assets, Net	$ 769	879
Permit [Member]
Finite-Lived Intangible Asset, Useful Life	10 years
Gross Carrying Amount	$ 545	545
Accumulated Amortization	(545)	(538)
Finite-Lived Intangible Assets, Net		$ 7