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Share-based payments - Valuations of share-based payments (Details)
3 Months Ended 10 Months Ended 57 Months Ended 90 Months Ended
Mar. 31, 2020
USD ($)
$ / shares
Mar. 31, 2020
USD ($)
Options
Mar. 31, 2020
USD ($)
Options
Mar. 31, 2020
USD ($)
Options
Minimum        
Valuations of share-based payments        
Forfeiture rate used in valuation models granted 0.00%      
Maximum        
Valuations of share-based payments        
Forfeiture rate used in valuation models granted 10.00%      
2012 Employee Stock Option Plan (ESOP)        
Valuations of share-based payments        
Number of options/ RSUs | Options       4,128,521
Weighted average share price | $ / shares $ 28.10      
Weighted average fair value per option | $ $ 7.14 $ 7.14 $ 7.14 $ 7.14
2012 Employee Stock Option Plan (ESOP) | Minimum        
Valuations of share-based payments        
Dividend yield, percentage 0.00%      
Volatility, percentage 28.00%      
Risk-free interest rate, percentage 0.29%      
Expected term, years 2 years      
2012 Employee Stock Option Plan (ESOP) | Maximum        
Valuations of share-based payments        
Dividend yield, percentage 5.03%      
Volatility, percentage 49.85%      
Risk-free interest rate, percentage 3.85%      
Expected term, years 4 years      
2015 Restricted Stock Unit Plan (RSU)        
Valuations of share-based payments        
Number of options/ RSUs | Options     2,035,808  
Weighted average share price | $ / shares $ 15.26      
Weighted average fair value per option | $ $ 14.56 $ 14.56 $ 14.56 14.56
2015 Restricted Stock Unit Plan (RSU) | Minimum        
Valuations of share-based payments        
Dividend yield, percentage 0.00%      
Volatility, percentage 40.65%      
Risk-free interest rate, percentage 2.89%      
Expected term, years 2 years      
2015 Restricted Stock Unit Plan (RSU) | Maximum        
Valuations of share-based payments        
Dividend yield, percentage 5.70%      
Volatility, percentage 64.02%      
Risk-free interest rate, percentage 4.34%      
Expected term, years 4 years      
2019 Employee Stock Option Plan (ESOP)        
Valuations of share-based payments        
Number of options/ RSUs | Options   1,280,000    
Dividend yield, percentage 5.70%      
Volatility, percentage 41.12%      
Weighted average share price | $ / shares $ 19.81      
Weighted average fair value per option | $ $ 5.23 $ 5.23 $ 5.23 $ 5.23
2019 Employee Stock Option Plan (ESOP) | Minimum        
Valuations of share-based payments        
Risk-free interest rate, percentage 1.91%      
Expected term, years 0 years      
2019 Employee Stock Option Plan (ESOP) | Maximum        
Valuations of share-based payments        
Risk-free interest rate, percentage 1.94%      
Expected term, years 2 years