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Summary of significant accounting policies (Details)
 12 Months Ended
Dec. 31, 2017
Amendments to IFRS 2 [Member]  
Title of new IFRS Amendments to IFRS 2
Description of nature of impending change in accounting policy Classification and Measurement of Share-based Payment Transactions.
Date by which application of new IFRS is required Jan. 01, 2018
IFRIC Interpretation 22 [Member]  
Title of new IFRS IFRIC Interpretation 22
Description of nature of impending change in accounting policy Foreign Currency Transactions and Advance Consideration.
Date by which application of new IFRS is required Jan. 01, 2018
Amendments to IAS 40 [Member]  
Title of new IFRS Amendments to IAS 40
Description of nature of impending change in accounting policy Transfers of Investment Property.
Date by which application of new IFRS is required Jan. 01, 2018
Improvement to IAS 28 [Member]  
Title of new IFRS Improvement to IAS 28
Description of nature of impending change in accounting policy Investment in Associates and Joint Ventures: Measuring an associate or joint venture at fair value.
Date by which application of new IFRS is required Jan. 01, 2018
IFRS 9 [Member]  
Title of new IFRS IFRS 9
Description of nature of impending change in accounting policy Financial Instruments.
Date by which application of new IFRS is required Jan. 01, 2018
IFRS 15 [Member]  
Title of new IFRS IFRS 15
Description of nature of impending change in accounting policy Revenue fro Contracts with Customers.
Date by which application of new IFRS is required Jan. 01, 2018
Amendments to IFRS 15 [Member]  
Title of new IFRS Amendments to IFRS 15
Description of nature of impending change in accounting policy Clarifications to IFRS 15 Revenue fro Contracts with Customers.
Date by which application of new IFRS is required Jan. 01, 2018
IFRS 16 [Member]  
Title of new IFRS IFRS 16
Description of nature of impending change in accounting policy Leases.
Date by which application of new IFRS is required Jan. 01, 2019
IFRC 23 [Member]  
Title of new IFRS IFRC 23
Description of nature of impending change in accounting policy Uncertainty over Income Tax Treatments.
Date by which application of new IFRS is required Jan. 01, 2019
Amendments to IFRS 9 [Member]  
Title of new IFRS Amendments to IFRS 9
Description of nature of impending change in accounting policy Financial Instruments.
Date by which application of new IFRS is required Jan. 01, 2019
Amendments to IAS 28 [Member]  
Title of new IFRS Amendments to IAS 28
Description of nature of impending change in accounting policy Investment in Associates and Joint Ventures
Date by which application of new IFRS is required Jan. 01, 2019
Amendments to IFRS 3 [Member]  
Title of new IFRS Amendments to IFRS 3
Description of nature of impending change in accounting policy Business combination.
Date by which application of new IFRS is required Jan. 01, 2019
Amendments to IFRS 11 [Member]  
Title of new IFRS Amendments to IFRS 11
Description of nature of impending change in accounting policy Joint arrangements.
Date by which application of new IFRS is required Jan. 01, 2019
Amendments to IAS 12 [Member]  
Title of new IFRS Amendments to IAS 12
Description of nature of impending change in accounting policy Income taxes.
Date by which application of new IFRS is required Jan. 01, 2019
Amendments to IAS 23 [Member]  
Title of new IFRS Amendments to IAS 23
Description of nature of impending change in accounting policy Borrowing costs.
Date by which application of new IFRS is required Jan. 01, 2019