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Summary of significant accounting policies (Schedule of Estimated Useful Lives Annual Rates) (Details)
 12 Months Ended
Dec. 31, 2015
Office equipment [Member]  
Depreciation rate 20.00%
Furniture and fixtures [Member] | Minimum [Member]  
Depreciation rate 20.00%
Furniture and fixtures [Member] | Maximum [Member]  
Depreciation rate 50.00%