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Segment Reporting and Concentrations - Revenues by geographic region (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Segment Reporting Information [Line Items]        
Revenues $ 13,863 $ 13,639 $ 28,393 $ 27,333
Other - principally Europe        
Segment Reporting Information [Line Items]        
Revenues 1,940 1,838 3,824 3,477
United States        
Segment Reporting Information [Line Items]        
Revenues 6,258 6,223 12,948 12,754
United Kingdom        
Segment Reporting Information [Line Items]        
Revenues 2,681 2,408 5,452 4,726
The Netherlands        
Segment Reporting Information [Line Items]        
Revenues 1,659 1,694 3,299 3,416
Canada        
Segment Reporting Information [Line Items]        
Revenues $ 1,325 $ 1,476 $ 2,870 $ 2,960