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Significant Accounting Policies - Summary of Depreciation on Property, Plant and Equipment Over Their Expected Useful Economic Life (Detail)
 12 Months Ended
Dec. 31, 2020
Office and Computer Equipment [member]  
Disclosure Of Property Plant And Equipment [Line Items]  
Depreciation method Straight-line
Depreciation rate 3 years
Right of Use Assets [member]  
Disclosure Of Property Plant And Equipment [Line Items]  
Depreciation method Straight-line
Right of Use Assets [member] | Minimum [member]  
Disclosure Of Property Plant And Equipment [Line Items]  
Depreciation rate 2 years
Right of Use Assets [member] | Maximum [member]  
Disclosure Of Property Plant And Equipment [Line Items]  
Depreciation rate 5 years
Fixtures and Fittings [member]  
Disclosure Of Property Plant And Equipment [Line Items]  
Depreciation method Straight-line
Depreciation rate 5 years