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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

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