Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Income Tax [Line Items]
Intangible assets, Gross	$ 16,155	$ 19,256
Accumulated Amortization	(8,425)	(10,250)
Intangible assets, net	7,730	9,006
Trade Names [Member]
Income Tax [Line Items]
Intangible assets, Gross	980	980
Accumulated Amortization	(457)	(359)
Intangible assets, net	523	621
Notice of Acceptances (NOAs), Product Designs and Other Intellectual Property [Member]
Income Tax [Line Items]
Intangible assets, Gross	10,870	10,881
Accumulated Amortization	(5,822)	(5,373)
Intangible assets, net	5,048	5,508
Non-compete Agreement [Member]
Income Tax [Line Items]
Intangible assets, Gross	165	165
Accumulated Amortization	(77)	(60)
Intangible assets, net	88	105
Customer Relationships [Member]
Income Tax [Line Items]
Intangible assets, Gross	4,140	4,140
Accumulated Amortization	(2,069)	(1,626)
Intangible assets, net	$ 2,071	2,514
Contract Backlog [Member]
Income Tax [Line Items]
Intangible assets, Gross		3,090
Accumulated Amortization		(2,832)
Intangible assets, net		$ 258