Annual report pursuant to Section 13 and 15(d)

Permit and Other Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details)

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Permit and Other Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Asset, Useful Life 10 years 10 years
Gross Carrying Amount $ 4,982 $ 4,897
Accumulated Amortization (3,433) (3,059)
Finite-Lived Intangible Assets, Net 1,549 1,838
Patent [Member]    
Gross Carrying Amount 657 577
Accumulated Amortization (306) (274)
Finite-Lived Intangible Assets, Net $ 351 303
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 $ 410 405
Accumulated Amortization (398) (383)
Finite-Lived Intangible Assets, Net $ 12 22
Customer Relationships [Member]    
Finite-Lived Intangible Asset, Useful Life 12 years  
Gross Carrying Amount $ 3,370 3,370
Accumulated Amortization (2,246) (1,974)
Finite-Lived Intangible Assets, Net $ 1,124 1,396
Permit [Member]    
Finite-Lived Intangible Asset, Useful Life 10 years  
Gross Carrying Amount $ 545 545
Accumulated Amortization (483) (428)
Finite-Lived Intangible Assets, Net $ 62 $ 117