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Segment Reporting and Concentrations - Long-lived assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets $ 22,004 $ 15,138
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 4,740 4,383
Canada    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 8,709 7,023
United Kingdom    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 1,840 2,045
Philippines [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 5,326 900
India [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 634 475
Sri Lanka [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 733 280
Israel [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 21 30
Germany [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 1 2
Foreign Countries [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets $ 17,264 $ 10,755