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Segment reporting and concentrations - Long-lived assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Revenues from external customers and long-lived assets    
Long - lived assets $ 21,926 $ 21,384
United States    
Revenues from external customers and long-lived assets    
Long - lived assets 8,422 7,205
Canada    
Revenues from external customers and long-lived assets    
Long - lived assets 7,612 7,675
Philippines    
Revenues from external customers and long-lived assets    
Long - lived assets 3,550 3,682
United Kingdom    
Revenues from external customers and long-lived assets    
Long - lived assets 1,136 1,198
India    
Revenues from external customers and long-lived assets    
Long - lived assets 788 1,195
Sri Lanka    
Revenues from external customers and long-lived assets    
Long - lived assets 416 426
Israel    
Revenues from external customers and long-lived assets    
Long - lived assets 2 3
Total foreign    
Revenues from external customers and long-lived assets    
Long - lived assets $ 13,504 $ 14,179