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Revenue by geographic areas (Details) - USD ($) | 12 Months Ended
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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

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