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NET LOSS PER SHARE - Weighted-average numbers of senior convertible preferred shares, convertible notes and options granted excluded from the calculation of diluted net loss per share (Details) - shares	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from the calculation of diluted net loss per share	257,861,901	245,389,524	230,262,825	257,295,925
Senior convertible preferred shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from the calculation of diluted net loss per share		240,274,690
Convertible notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from the calculation of diluted net loss per share	253,165,870		223,300,971	253,165,870
Outstanding weighted average share options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from the calculation of diluted net loss per share	4,662,702	5,114,834	6,961,854	4,096,724
Non-vested restricted shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from the calculation of diluted net loss per share	33,329			33,331

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://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257

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+ References

No definition available.

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