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Segment Reporting and Concentrations - Long-lived assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets $ 20,678 $ 20,643
US    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 4,367 4,045
Canada    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 9,238 9,044
United Kingdom    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 1,577 1,759
Philippines    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 4,162 4,545
India    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 1,140 930
Sri Lanka    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 194 319
Israel    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets   1
Total Foreign    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets $ 16,311 $ 16,598