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Segment reporting and concentrations (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets $ 10,186 $ 12,811
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 1,104 1,600
Canada    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 5,223 6,061
India    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 1,611 2,136
Philippines    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 1,580 2,081
Sri Lanka    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 635 890
Israel    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 31 29
Germany    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets 2 14
Foreign Countries    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long - lived assets $ 9,082 $ 11,211