Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details)

v3.19.1
Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Gross Carrying Amount $ 5,062 $ 5,053
Accumulated Amortization (3,839) (3,768)
Finite-Lived Intangible Assets, Net 1,223 1,285
Patent [Member]    
Gross Carrying Amount 735 728
Accumulated Amortization (344) (336)
Finite-Lived Intangible Assets, Net $ 391 392
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 $ 412 410
Accumulated Amortization (404) (403)
Finite-Lived Intangible Assets, Net $ 8 7
Customer Relationships [Member]    
Finite-Lived Intangible Asset, Useful Life 10 years  
Gross Carrying Amount $ 3,370 3,370
Accumulated Amortization (2,546) (2,491)
Finite-Lived Intangible Assets, Net $ 824 879
Permit [Member]    
Finite-Lived Intangible Asset, Useful Life 10 years  
Gross Carrying Amount $ 545 545
Accumulated Amortization (545) (538)
Finite-Lived Intangible Assets, Net $ 7