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Segment Reporting and Concentrations - Long-lived assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets $ 20,425 $ 21,715
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 4,455 4,591
Canada    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 8,216 8,876
United Kingdom    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 1,738 1,907
Philippines [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 4,998 5,135
India [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 381 508
Sri Lanka [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 632 678
Israel [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 4 19
Germany [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 1 1
Foreign Countries [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets $ 15,970 $ 17,124