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Revenue by geographic areas (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
United States    
Revenues: (in thousands) $ 14,343 $ 12,840
Europe    
Revenues: (in thousands) 2,698 2,864
Asia and rest of world    
Revenues: (in thousands) 1,359 1,317
Total    
Revenues: (in thousands) $ 18,400 $ 17,021