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Segment reporting and concentrations - Long-lived assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Revenues from external customers and long-lived assets    
Long - lived assets $ 21,807 $ 21,384
United States    
Revenues from external customers and long-lived assets    
Long - lived assets 7,944 7,205
Canada    
Revenues from external customers and long-lived assets    
Long - lived assets 7,633 7,675
United Kingdom    
Revenues from external customers and long-lived assets    
Long - lived assets 1,160 1,198
Philippines    
Revenues from external customers and long-lived assets    
Long - lived assets 3,631 3,682
India    
Revenues from external customers and long-lived assets    
Long - lived assets 991 1,195
Sri Lanka    
Revenues from external customers and long-lived assets    
Long - lived assets 446 426
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 $ 13,863 $ 14,179