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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