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Fair Value Measurements - Reconciliation of fair value measurements of available-for-sale debt investments (Details) - Available-for-sale Securities - CNY (¥) ¥ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Fair Value Measurements |  |  |
Beginning balance | ¥ 1,961,474 | ¥ 1,196,330 | ¥ 939,432
Change in fair value | 1,385,379 | 698,592 | 321,538
Disposal of part available-for-sale debt investments | (1,390,031) |  |
Currency translation adjustment | 57,715 | 64,552 | (64,640)
Additional investments |  | 2,000 |
Ending balance | ¥ 2,014,537 | ¥ 1,961,474 | ¥ 1,196,330

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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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 (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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