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Segment Reporting and Concentrations - Long-lived assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets $ 20,637 $ 21,477
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 4,162 4,521
Canada    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 8,532 8,708
United Kingdom    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 1,699 1,907
Philippines    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 4,688 5,135
India    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 1,025 508
Sri Lanka    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 529 678
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 1
Total Foreign    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets $ 16,475 $ 16,956