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Revenue by geographic areas (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
United States    
Revenues: (in thousands) $ 16,851 $ 14,343
Europe    
Revenues: (in thousands) 2,843 2,698
Asia and rest of world    
Revenues: (in thousands) 1,094 1,359
Total    
Revenues: (in thousands) $ 20,788 $ 18,400