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Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Income Tax [Line Items]    
Intangible assets, Gross $ 19,360 $ 19,256
Accumulated Amortization (10,992) (10,250)
Intangible assets, net 8,368 9,006
Trade Names [Member]    
Income Tax [Line Items]    
Intangible assets, Gross 980 980
Accumulated Amortization (408) (359)
Intangible assets, net 572 621
Notice of Acceptances (NOAs), Product Designs and Other Intellectual Property [Member]    
Income Tax [Line Items]    
Intangible assets, Gross 10,985 10,881
Accumulated Amortization (5,577) (5,373)
Intangible assets, net 5,408 5,508
Non-compete Agreements [Member]    
Income Tax [Line Items]    
Intangible assets, Gross 165 165
Accumulated Amortization (69) (60)
Intangible assets, net 96 105
Contract Backlog [Member]    
Income Tax [Line Items]    
Intangible assets, Gross 3,090 3,090
Accumulated Amortization (3,090) (2,832)
Intangible assets, net 258
Customer Relationships [Member]    
Income Tax [Line Items]    
Intangible assets, Gross 4,140 4,140
Accumulated Amortization (1,848) (1,626)
Intangible assets, net $ 2,292 $ 2,514