Summary of significant accounting policies (Details 1) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenue	$ 176	$ 297	$ 640	$ 615
Cost of revenue	(39)	(168)	(225)	(384)
Gross margin	137	129	415	231
Operating expenses	(366)	(572)	(1,202)	(1,415)
Net loss	$ (229)	$ (443)	$ (787)	$ (1,184)

Amount of costs of goods sold attributable to disposal group, including, but not limited to, discontinued operation.

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