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Share-based Payments - Summary of Fair Value of Options Issued (Details) - Stock options
6 Months Ended
Jun. 30, 2019
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Expected life of options (in years) 5 years
Expected annualized volatility 80.00%
Expected dividend yield 0.00%
Forfeiture rate 0.00%
Minimum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share price at grant date (in dollars per share) $ 20.65
Exercise price (per option) (in dollars per share) $ 20.65
Risk-free interest rate 1.51%
Weighted average Black-Scholes value at grant date (per option) (in dollars per share) $ 13.29
Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share price at grant date (in dollars per share) 24.75
Exercise price (per option) (in dollars per share) $ 24.75
Risk-free interest rate 1.62%
Weighted average Black-Scholes value at grant date (per option) (in dollars per share) $ 15.91