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Summary of significant accounting policies (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure for rate of depreciation using the straight-line method over the estimated useful lives of the assets. + References No definition available. + Details
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