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Share-based compensation - Share-based Compensation Expenses (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Share Based Compensation Expense Recognized [Line Items]    
Share-based compensation expenses $ 2,275 $ 22,361
Share-based compensation capitalized in intangible assets 15 55
Share-based compensation expenses, Total 2,290 22,701
Selling and Marketing Expense    
Share Based Compensation Expense Recognized [Line Items]    
Share-based compensation expenses 369 666
Research and Development Expense    
Share Based Compensation Expense Recognized [Line Items]    
Share-based compensation expenses 245 158
General and Administrative Expenses    
Share Based Compensation Expense Recognized [Line Items]    
Share-based compensation expenses 1,661 415
Spin-off Transaction Costs    
Share Based Compensation Expense Recognized [Line Items]    
Share-based compensation expenses 0 5,409
Discontinued Operations    
Share Based Compensation Expense Recognized [Line Items]    
Share-based compensation expenses 0 15,713
Share-based compensation capitalized in intangible assets 0 181
Continuing Operations    
Share Based Compensation Expense Recognized [Line Items]    
Share-based compensation capitalized in intangible assets $ 15 $ 159