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Segment Reporting and Concentrations - Revenues by geographic region (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Segment Reporting Information [Line Items]        
Revenues $ 13,846 $ 14,049 $ 41,179 $ 42,439
United States        
Segment Reporting Information [Line Items]        
Revenues 6,022 6,481 18,776 18,452
United Kingdom        
Segment Reporting Information [Line Items]        
Revenues 2,394 2,403 7,120 8,387
The Netherlands        
Segment Reporting Information [Line Items]        
Revenues 1,730 1,896 5,146 5,485
Canada        
Segment Reporting Information [Line Items]        
Revenues 1,634 1,459 4,594 4,397
Other - principally Europe        
Segment Reporting Information [Line Items]        
Revenues $ 2,066 $ 1,810 $ 5,543 $ 5,718