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Equity - Summary of Weighted Average Assumptions Used for Valuation of Share Options Granted (Details) - yr
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Abstract]    
Risk-free interest rate 2.20% 1.20%
Expected life of options 4.5 4.5
Annualized volatility 47.40% 75.40%
Forfeiture rate 2.20% 2.20%
Dividend rate 0.00% 0.00%