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Segment Reporting and Concentrations - Long-lived assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets $ 20,262 $ 20,643
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 3,901 4,045
Canada    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 9,160 9,044
United Kingdom    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 1,703 1,759
Philippines    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 4,386 4,545
India    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 833 930
Sri Lanka    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 279 319
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 $ 16,361 $ 16,598