Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Gross Carrying Amount	$ 5,019	$ 4,982
Accumulated Amortization	(3,602)	(3,433)
Finite-Lived Intangible Assets, Net	1,417	1,549
Patent [Member]
Gross Carrying Amount	694	657
Accumulated Amortization	(322)	(306)
Finite-Lived Intangible Assets, Net	$ 372	351
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	$ 410	410
Accumulated Amortization	(402)	(398)
Finite-Lived Intangible Assets, Net	$ 8	12
Customer Relationships [Member]
Finite-Lived Intangible Asset, Useful Life	12 years
Gross Carrying Amount	$ 3,370	3,370
Accumulated Amortization	(2,368)	(2,246)
Finite-Lived Intangible Assets, Net	$ 1,002	1,124
Permit [Member]
Finite-Lived Intangible Asset, Useful Life	10 years
Gross Carrying Amount	$ 545	545
Accumulated Amortization	(510)	(483)
Finite-Lived Intangible Assets, Net	$ 35	$ 62