Summary of Significant Accounting Policies - Fair Value of Financial Instruments (Details) ¥ in Thousands	12 Months Ended
Dec. 31, 2019 CNY (¥) segment	Dec. 31, 2018 CNY (¥) segment
Fair value of financial instruments
Available-for-sale debt securities		¥ 130,358
Segment reporting
Number of Operating Segments \| segment	4	2
Financial Guarantee
Fair value of financial instruments
Other liabilities	¥ (8,847)
Share Based Compensation
Fair value of financial instruments
Other liabilities	(5,726)
Level 3 \| Financial Guarantee
Fair value of financial instruments
Other liabilities	(8,847)
Level 3 \| Share Based Compensation
Fair value of financial instruments
Other liabilities	(5,726)
Recurring
Fair value of financial instruments
Equity investments with readily determinable fair value	506,302	¥ 217,036
Available-for-sale debt securities		130,358
Recurring \| Level 1
Fair value of financial instruments
Equity investments with readily determinable fair value	¥ 506,302	217,036
Recurring \| Level 2
Fair value of financial instruments
Available-for-sale debt securities		¥ 130,358

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563

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Amount 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 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740

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Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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