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Significant Customer Concentration (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Concentration Risk Percentage [Abstract]                        
Revenues, net $ 7,729 $ 7,388 $ 6,738 $ 7,456 $ 8,445 $ 7,269 $ 14,126 $ 15,714 $ 21,856 $ 23,169 $ 29,855 $ 31,763
Revenue [Member] | Customer Concentration Risk [Member]                        
Concentration Risk Percentage [Abstract]                        
Revenues, net                     $ 6,553 $ 5,264
Concentration risk percentage                     21.90% 16.60%
Accounts Receivable [Member] | Customer Concentration Risk [Member]                        
Concentration Risk Percentage [Abstract]                        
Accounts receivable                     $ 404 $ 475
Concentration risk percentage                     11.90% 15.10%