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Significant Accounting Policies (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Sales and Marketing Expenses      
Advertising and promotional expenses $ 92,200,000 $ 81,200,000 $ 71,000,000
Operating leases      
Allocated rental expenses from SINA 25,703,000 24,678,000 42,360,000
Long-term investments      
Impairment charge 31,586,000 6,608,000 2,521,000
Impairment charge to AFS securities $ 4,800,000 0 0
Stock options      
Stock-based compensation      
Vesting period 4 years    
Service-based restricted share units      
Stock-based compensation      
Vesting period 4 years    
Rental expense      
Operating leases      
Allocated rental expenses from SINA $ 3,900,000 3,500,000 4,000,000
Minimum      
Operating leases      
Lease period 1 year    
Maximum      
Operating leases      
Lease period 5 years    
Accounts payable      
Basis of presentation      
Prior period reclassification adjustment   37,900,000  
Accrued and other liabilities      
Basis of presentation      
Prior period reclassification adjustment   (37,900,000)  
Advertising and marketing revenues      
Cost of revenues      
VAT and surcharges (as a percent) 6.70%    
Cultural business construction fees (as a percent) 3.00%    
Taxes on advertising and marketing revenues $ 49,900,000 $ 35,300,000 $ 23,200,000
Advertising and marketing revenues | Maximum      
Revenue recognition      
Period over social display ad arrangements allow customers to place advertisements on particular areas of the Group's platform in particular formats 3 months    
Other revenues      
Game-related service      
Maximum period for recognition of revenues after purchase of in-game credits 1 month    
Data licensing arrangement term 1 year