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LOSS PER SHARE - Shae options outstanding excluded from calculation of diluted loss per share (Details) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Series A convertible preferred shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Excluded from the calculation of diluted loss per share (in shares)			4,200,000
Series B convertible preferred shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Excluded from the calculation of diluted loss per share (in shares)			11,396,178
Series C convertible preferred shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Excluded from the calculation of diluted loss per share (in shares)			31,739,234
Series D convertible preferred shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Excluded from the calculation of diluted loss per share (in shares)			27,783,584
Share options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Excluded from the calculation of diluted loss per share (in shares)	9,311,906	9,997,216	5,010,912

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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