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Staff Costs - Schedule of Average Number of Staff Employed Under Contracts of Service Explanatory (Details) - Employee
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Staff Costs [Line Items]      
Average number of staff employed under contracts of service 30 28 22
Research and Development Expenses      
Staff Costs [Line Items]      
Average number of staff employed under contracts of service 24 23 18
Administrative Expenses      
Staff Costs [Line Items]      
Average number of staff employed under contracts of service 6 5 4