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Revenue by geographic areas (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
United States
   
Revenues: (in thousands) $ 10,918 $ 8,078
Europe
   
Revenues: (in thousands) 2,728 3,554
Asia and rest of world
   
Revenues: (in thousands) 2,015 1,933
Total
   
Revenues: (in thousands) $ 15,661 $ 13,565