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Segment Reporting and Concentrations - Long-lived assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets $ 20,643 $ 21,477
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 4,045 4,521
Canada    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 9,044 8,708
United Kingdom    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 1,759 1,907
Philippines    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 4,545 5,135
India    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 930 508
Sri Lanka    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 319 678
Israel    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 1 19
Germany    
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 $ 16,598 $ 16,956