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Segment reporting and concentrations - Revenues by geographic region (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Segment Reporting Information [Line Items]    
Revenues $ 69,755 $ 58,240
US    
Segment Reporting Information [Line Items]    
Revenues 38,164 26,764
United Kingdom    
Segment Reporting Information [Line Items]    
Revenues 11,588 11,184
The Netherlands    
Segment Reporting Information [Line Items]    
Revenues 6,547 6,695
Canada    
Segment Reporting Information [Line Items]    
Revenues 6,190 5,791
Other - principally Europe    
Segment Reporting Information [Line Items]    
Revenues $ 7,266 $ 7,806