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Segment Reporting and Concentrations (Details 1) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Segment Reporting Information [Line Items]    
Revenues $ 13,694 $ 14,120
United States    
Segment Reporting Information [Line Items]    
Revenues 6,531 5,979
United Kingdom    
Segment Reporting Information [Line Items]    
Revenues 2,318 2,955
The Netherlands    
Segment Reporting Information [Line Items]    
Revenues 1,722 1,762
Canada    
Segment Reporting Information [Line Items]    
Revenues 1,484 1,469
Other - principally Europe    
Segment Reporting Information [Line Items]    
Revenues $ 1,639 $ 1,955