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Revenue by geographic areas (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
United States
Revenues: (in thousands)	$ 16,621	$ 16,851
Europe
Revenues: (in thousands)	3,572	2,843
Asia and rest of world
Revenues: (in thousands)	1,093	1,094
Total
Revenues: (in thousands)	$ 21,286	$ 20,788

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