Annual report pursuant to Section 13 and 15(d)

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

v3.19.1
Permit and Other Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Asset, Useful Life 10 years 10 years
Gross Carrying Amount $ 5,053 $ 4,982
Accumulated Amortization (3,768) (3,433)
Finite-Lived Intangible Assets, Net 1,285 1,549
Patent [Member]    
Gross Carrying Amount 728 657
Accumulated Amortization (336) (306)
Finite-Lived Intangible Assets, Net $ 392 351
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 $ 410 410
Accumulated Amortization (403) (398)
Finite-Lived Intangible Assets, Net $ 7 12
Customer Relationships [Member]    
Finite-Lived Intangible Asset, Useful Life 10 years  
Gross Carrying Amount $ 3,370 3,370
Accumulated Amortization (2,491) (2,246)
Finite-Lived Intangible Assets, Net $ 879 1,124
Permit [Member]    
Finite-Lived Intangible Asset, Useful Life 10 years  
Gross Carrying Amount $ 545 545
Accumulated Amortization (538) (483)
Finite-Lived Intangible Assets, Net $ 7 $ 62