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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2016
Fair Value Measurements [Abstract] |
Financial instruments measured at fair value by level within the fair value hierarchy |
|  |  |  | Fair Value Measurements at Reporting Date Using |
|  | Carrying Value on Balance Sheets |  | Quote Prices in Active Market for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |
|  | RMB |  | RMB |  | RMB |  | RMB |
As of December 31, 2015: |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |
Term deposits and short term investments |  | 769,681 |  | 106,907 |  | 662,774 |  | — |
Restricted cash |  | 125,000 |  | 125,000 |  | — |  | — |
Available-for-sale investments |  | 513,994 |  | — |  | — |  | 513,994 |
As of December 31, 2016: |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |
Term deposits and short term investments |  | 781,298 |  | 22,198 |  | 759,100 |  | — |
Restricted cash |  | 354,602 |  | 354,602 |  | — |  | — |
Available-for-sale investments |  | 939,432 |  | — |  | — |  | 939,432 |
Reconciliation of the fair value measurements of available-for-sale investments using significant unobservable inputs (level 3) |
|  | Fair Value Measurements Using Significant Unobservable Inputs |
|  | (Level 3) |
|  | RMB |
Beginning balance as of January 1, 2015 |  | 77,093 |
Additional investments |  | 352,008 |
Additional investments obtained from conversion of ordinary shares |  | 40,538 |
Change in fair value |  | 15,869 |
Currency translation adjustment |  | 28,486 |
Ending balance as of December 31, 2015 |  | 513,994 |
Additional investments obtained from conversion of convertible loans |  | 143,820 |
Change in fair value |  | 247,336 |
Currency translation adjustment |  | 34,282 |
Ending balance as of December 31, 2016 |  | 939,432 |
Key inputs used in available-for-sale investments valuation |
|  | As of December 31, |
|  | 2015 |  | 2016 |
Discount rate |  | 25.5 | % | 23.0 | %
Lack of marketability discount (“DLOM”) |  | 26.0 | % | 25.0 | %
Volatility |  | 50.3 | % | 47.0 | %
Revenue growth rate |  | 5.0%-503.0 | % | 10.0%-349.0 | %
Terminal growth rate |  | 3.0 | % | 3.0 | %

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 + Details
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- Definition Tabular disclosure of quantitative information about the inputs used in the fair value measurement of assets. This disclosure may include, but is not limited to, the fair value of the asset, valuation technique used to measure fair value, the inputs used to measure fair value, the ranges of the inputs, and the weighted averages of the inputs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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