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Segment reporting and concentrations - Long-lived assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets $ 21,028 $ 21,058
US    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 6,042 4,578
Canada    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 8,156 9,280
United Kingdom    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 1,292 1,538
Philippines    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 3,858 4,027
India    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 1,522 1,481
Sri Lanka    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 156 154
Israel    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 2  
Total Foreign    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets $ 14,986 $ 16,480