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Share-based compensation - Share-based Compensation Expenses (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Share Based Compensation Expense Recognized [Line Items]        
Share-based compensation expenses $ 2,614 $ 9,319 $ 24,975 $ 16,631
Share-based compensation capitalized in intangible assets     283 188
Share-based compensation expenses, Total 2,738 9,654 25,439 17,212
Selling and Marketing Expense [Member]        
Share Based Compensation Expense Recognized [Line Items]        
Share-based compensation expenses 709 792 1,475 1,404
General and Administrative Expenses [Member]        
Share Based Compensation Expense Recognized [Line Items]        
Share-based compensation expenses 1,905 7,302 2,378 13,544
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   1,225 15,713 1,683
Share-based compensation capitalized in intangible assets   202 181 393
Continuing Operations [Member]        
Share Based Compensation Expense Recognized [Line Items]        
Share-based compensation capitalized in intangible assets $ 124 $ 133 $ 283 $ 188