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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 |  |

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