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Summary of significant accounting policies (Tables)
 12 Months Ended
Dec. 31, 2016
Accounting Policies [Abstract]  
Property, Plant and Equipment, Estimated Useful Lives, Depreciation Rates [Table Text Block]
Property and equipment are stated at cost, net of accumulated depreciation. Depreciation is calculated using the straight-line method over the estimated useful lives of the assets at the following rates:
 
 
 
 
%
 
 
 
 
 
 
Computers and software
 
 
33
 
Electronic equipment
 
 
15
 
Office furniture and equipment
 
 
6
 
Leasehold improvements
 
 
The shorter of term of the lease or the useful life of the asset