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Significant Accounting Policies - Summary of Depreciation on Property, Plant and Equipment Over Their Expected Useful Economic Life (Details)
12 Months Ended
Dec. 31, 2017
Office and Computer Equipment  
Disclosure Of Property Plant And Equipment [Line Items]  
Depreciation method Straight-line
Depreciation rate 3 years
Fixtures and Fittings  
Disclosure Of Property Plant And Equipment [Line Items]  
Depreciation method Straight-line
Depreciation rate 5 years