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Segment Reporting and Concentrations - Revenues by geographic region (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]    
Revenues $ 55,858 $ 57,418
Other - principally Europe    
Segment Reporting Information [Line Items]    
Revenues 7,750 7,668
United States    
Segment Reporting Information [Line Items]    
Revenues 25,357 25,403
United Kingdom    
Segment Reporting Information [Line Items]    
Revenues 9,577 10,874
The Netherlands    
Segment Reporting Information [Line Items]    
Revenues 6,982 7,488
Canada    
Segment Reporting Information [Line Items]    
Revenues $ 6,192 $ 5,985