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Goodwill and Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Income Tax [Line Items]    
Intangible assets, Gross $ 19,323 $ 19,201
Accumulated Amortization (9,437) (7,684)
Intangible assets, net 9,886 11,517
Trade Names [Member]    
Income Tax [Line Items]    
Intangible assets, Gross 980 980
Accumulated Amortization (310) (163)
Intangible assets, net 670 817
Notice of Acceptances (NOAs), Product Designs and Other Intellectual Property [Member]    
Income Tax [Line Items]    
Intangible assets, Gross 10,948 10,826
Accumulated Amortization (5,225) (5,467)
Intangible assets, net 5,723 5,359
Non-compete Agreements [Member]    
Income Tax [Line Items]    
Intangible assets, Gross 165 165
Accumulated Amortization (52) (28)
Intangible assets, net 113 137
Contract Backlog [Member]    
Income Tax [Line Items]    
Intangible assets, Gross 3,090 3,090
Accumulated Amortization (2,446) (1,287)
Intangible assets, net 644 1,803
Customer Relationships [Member]    
Income Tax [Line Items]    
Intangible assets, Gross 4,140 4,140
Accumulated Amortization (1,404) (739)
Intangible assets, net $ 2,736 $ 3,401