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Share-based compensation - Share-based Compensation Expenses (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share Based Compensation Expense Recognized [Line Items]        
Share-based compensation expenses $ 2,954 $ 2,614 $ 5,229 $ 24,975
Share-based compensation capitalized in intangible assets     45 283
Share-based compensation expenses, Total 2,984 2,738 5,274 25,439
Discontinued Operations        
Share Based Compensation Expense Recognized [Line Items]        
Share-based compensation expenses 0 0 0 15,713
Share-based compensation capitalized in intangible assets 0 0 0 181
Continuing Operations        
Share Based Compensation Expense Recognized [Line Items]        
Share-based compensation capitalized in intangible assets 30 124 45 283
Continuing Operations | Sales and marketing        
Share Based Compensation Expense Recognized [Line Items]        
Share-based compensation expenses 160 742 529 1,408
Continuing Operations | Product development        
Share Based Compensation Expense Recognized [Line Items]        
Share-based compensation expenses 277 193 522 351
Continuing Operations | General and administrative        
Share Based Compensation Expense Recognized [Line Items]        
Share-based compensation expenses 2,517 1,679 4,178 2,094
Continuing Operations | Spin-off transaction costs        
Share Based Compensation Expense Recognized [Line Items]        
Share-based compensation expenses $ 0 $ 0 $ 0 $ 5,409