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Fair Value Measurements - Fair value hierarchy (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Fair Value Measurements |  |  |
Impairment charge | ¥ 0 | ¥ 0 | ¥ 10,000
Non-recurring |  |  |
Fair Value Measurements |  |  |
Liabilities fair value | 0 | 0 |
Assets fair value | 0 | ¥ 0 |
Quoted Price in Active Market for Identical Assets (Level 1) | Recurring | Short-term investments |  |  |
Fair Value Measurements |  |  |
Assets fair value | 11,925 |  |
Quoted Price in Active Market for Identical Assets (Level 1) | Recurring | Marketable equity securities |  |  |
Fair Value Measurements |  |  |
Assets fair value | 11,925 |  |
Significant Other Observable Inputs (Level 2) | Recurring | Short-term investments |  |  |
Fair Value Measurements |  |  |
Assets fair value | 795,849 |  |
Significant Other Observable Inputs (Level 2) | Recurring | Trading debt securities |  |  |
Fair Value Measurements |  |  |
Assets fair value | ¥ 795,849 |  |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=118954083&loc=SL6284422-111562 + Details
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