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Short-term Investments - Additional information (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2019 CNY (¥)
Short-term Investments |  |  |  |  |
Gross unrecognized holding gain of the held-to-maturity debt securities |  |  | ¥ 0 |  | ¥ 0
Gross unrecognized holding loss of the held-to-maturity debt securities |  |  | 0 |  | 0
Cost of trading debt securities | $ 114,317 |  | 0 |  | 795,849
Gross unrealized gain (loss) on debt trading securities |  | ¥ 0 | 0 |  |
Interest income on short-term investments | 71,863 | 500,298 | 115,737 | ¥ 12,483 |
Marketable Securities | 3,361 |  | 0 |  | ¥ 23,398
Unrealized loss for marketable equity securities | 1,648 | 11,473 |  |  |
Realized loss for marketable equity securities | $ 781 | ¥ 5,435 | ¥ 0 | ¥ 0 |

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- Definition Amount of realized loss from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=116654751&loc=SL75117546-209714 + Details
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