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Subsequent Events (Details) ¥ in Thousands, $ in Thousands			12 Months Ended
	Feb. 28, 2019 USD ($) shares	Feb. 28, 2019 CNY (¥) shares	Dec. 31, 2018 shares	Dec. 31, 2017 shares
Subsequent Events
Number of ordinary shares issued			366,943,308
Class A ordinary shares
Subsequent Events
Shares issued			2,381,240,988	42,486,360
Subsequent Events | Follow-on public offering
Subsequent Events
Total Proceeds, net of issuance cost	$ 1,180,080	¥ 8,113,640
Subsequent Events | ADSs | Follow-on public offering
Subsequent Events
Number of ordinary shares issued	48,435,000	48,435,000
Subsequent Events | Class A ordinary shares | Follow-on public offering
Subsequent Events
Number of ordinary shares issued	193,740,000	193,740,000

X

- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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X

- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
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- Definition

Number of new stock issued during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-Publisher FASB
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

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