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LOSS PER SHARE - Shae options outstanding excluded from calculation of diluted loss per share (Details) - shares | 12 Months Ended
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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

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- 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 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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