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PREFERRED SHARES (Details)
1 Months Ended 12 Months Ended
Apr. 30, 2019
shares
Feb. 21, 2017
Dec. 31, 2019
$ / shares
shares
Class of Stock [Line Items]      
Non-cumulative Dividend rate, as calculated on consideration paid for equity interests (as a percent)     8.00%
Liquidation preference (as a percent)     120.00%
Redemption events      
Qualified IPO Threshold completion period   60 months  
Significant breach, threshold correction period     30 days
Conversion      
Conversion ratio     1
Series Angel, A, B-1, B-2, B-3 and C      
Conversion      
Number of shares issued in conversion (in shares)     1,210,906,902
Conversion ratio     1
Number of shares converted     1,210,906,902
Series C-1 convertible redeemable preferred shares      
Conversion      
Number of shares issued in conversion (in shares) 18,612,084   18,612,084
Number of shares converted 18,597,738   18,597,738
Offering price | $ / shares     $ 8.00