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Share-based compensation - Share-based Compensation Expenses (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Share Based Compensation Expense Recognized [Line Items]    
Share-based compensation expenses $ 22,361 $ 7,312
Share-based compensation capitalized in intangible assets 159 55
Share-based compensation expenses, Total 22,701 7,558
Selling and Marketing Expense [Member]    
Share Based Compensation Expense Recognized [Line Items]    
Share-based compensation expenses 766 612
General and Administrative Expenses [Member]    
Share Based Compensation Expense Recognized [Line Items]    
Share-based compensation expenses 473 6,242
Spin-off Transaction Costs [Member]    
Share Based Compensation Expense Recognized [Line Items]    
Share-based compensation expenses 5,409  
Discontinued Operations [Member]    
Share Based Compensation Expense Recognized [Line Items]    
Share-based compensation expenses 15,713 458
Share-based compensation capitalized in intangible assets 181 191
Continuing Operations [Member]    
Share Based Compensation Expense Recognized [Line Items]    
Share-based compensation capitalized in intangible assets $ 159 $ 55