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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

X

- Definition

Amount of trading securities unrealized holding gain (loss).

+ References

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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
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- Definition

Amount of unrealized loss on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

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-Publisher FASB
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-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

+ References

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-Name Accounting Standards Codification
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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity).

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- Definition

Interest income derived from funds deposited with both domestic and foreign financial institutions including funds in money market and other accounts.

+ References

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Amount of investment in marketable security.

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Amortized cost of investments in debt securities classified as trading.

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