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Significant Accounting Policies - Concentration of Risks (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) customer Agency | Dec. 31, 2015 USD ($) Agency | Dec. 31, 2014 Agency
Concentration of risks |  |  |
Cash, cash equivalents and short-term investments | $ 395,954 | $ 335,879 |
Current liabilities denominated in RMB | 278,103 | 208,775 |
Cash, cash equivalents and short-term investments | Concentration of credit risk | China |  |  |
Concentration of risks |  |  |
Cash, cash equivalents and short-term investments | $ 393,600 | 334,600 |
Maximum term of original maturity of time deposits | 12 months |  |
Cash, cash equivalents and short-term investments | Concentration of foreign currency risks | RMB |  |  |
Concentration of risks |  |  |
Cash, cash equivalents and short-term investments | $ 335,700 | $ 157,900 |
Percentage of benchmark derived from specified source | 85.00% | 47.00% |
Consolidated net revenues benchmark | Customer concentration risk | Alibaba |  |  |
Concentration of risks |  |  |
Percentage of benchmark derived from specified source | 9.00% | 30.00% | 32.00%
Consolidated net accounts receivables benchmark | Concentration of credit risk | Alibaba |  |  |
Concentration of risks |  |  |
Percentage of benchmark derived from specified source | 21.00% | 45.00% |
Consolidated net accounts receivables benchmark | Concentration of credit risk | Customer |  |  |
Concentration of risks |  |  |
Percentage of benchmark derived from specified source | 15.00% | 16.00% |
Number of customers | customer | 1 |  |
Consolidated net accounts receivables benchmark | Concentration of foreign currency risks | RMB |  |  |
Concentration of risks |  |  |
Accounts receivable denominated in RMB | $ 115,300 | $ 120,100 |
Current liabilities | Concentration of foreign currency risks | RMB |  |  |
Concentration of risks |  |  |
Current liabilities denominated in RMB | $ 267,800 | $ 197,900 |
Percentage of benchmark derived from specified source | 96.00% | 95.00% |
Advertising & Marketing | Consolidated net revenues benchmark | Customer concentration risk | Top 10 advertising agencies | China |  |  |
Concentration of risks |  |  |
Number of advertising agencies | Agency | 10 | 10 | 10
Percentage of benchmark derived from specified source | 22.00% | 15.00% | 14.00%

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- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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