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Segment Reporting and Concentrations (Details 1) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Segment Reporting Information [Line Items]        
Revenues $ 14,270 $ 15,300 $ 28,390 $ 30,253
United States        
Segment Reporting Information [Line Items]        
Revenues 5,992 8,372 11,971 14,993
United Kingdom        
Segment Reporting Information [Line Items]        
Revenues 3,029 2,162 5,984 5,447
The Netherlands        
Segment Reporting Information [Line Items]        
Revenues 1,827 1,589 3,589 3,483
Canada        
Segment Reporting Information [Line Items]        
Revenues 1,469 1,370 2,938 2,845
Other - principally Europe        
Segment Reporting Information [Line Items]        
Revenues $ 1,953 $ 1,807 $ 3,908 $ 3,485