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Segment reporting and concentrations - Long-lived assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets $ 20,874 $ 21,058
US    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 5,306 4,578
Canada    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 8,411 9,280
United Kingdom    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 1,443 1,538
Philippines    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 3,959 4,027
India    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 1,557 1,481
Sri Lanka    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 198 154
Total Foreign    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets $ 15,568 $ 16,480