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Loss per share - Securities excluded (Details) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net (loss) income per share
Dilutive securities excluded	277,452,472	891,022,043	715,043,731
Series A-1 Preferred Shares
Net (loss) income per share
Dilutive securities excluded		102,102,318	102,102,318
Redeemable Convertible Preferred Shares
Net (loss) income per share
Dilutive securities excluded		612,941,413	612,941,413
Share options | Employees
Net (loss) income per share
Dilutive securities excluded	104,543,578	175,978,312
Share options | Series C preferred shareholder
Net (loss) income per share
Dilutive securities excluded	172,908,894

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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- Definition

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+ References

No definition available.

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