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LOSS BEFORE TAXATION - Additional Information - (Details) - CNY (¥)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of LOSS BEFORE TAXATION [Line Items]      
Employee benefits expense ¥ 33,302,000 ¥ 42,246,000 ¥ 68,025,000
Adjustment For Inventory Reversal Of Written Down 56,766,000 (55,973,000) 2,733,000
Cost Of inventories [Member]      
Disclosure of LOSS BEFORE TAXATION [Line Items]      
Employee benefits expense 19,867,000 27,087,000 48,857,000
Post-employment benefit expense, defined contribution plans 2,734,411 4,135,000 6,984,000
Operating Lease Payment 12,503,000 13,902,000 13,902,000
Reversal of inventory write-down 56,766,000    
Adjustment For Inventory Reversal Of Written Down   55,973,000 (2,733,000)
Depreciation and amortisation expense ¥ 0 ¥ 8,457,000 ¥ 11,203,000