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INCOME TAX EXPENSE/(CREDIT) - Reconciliation between income tax expense (credit) and (loss) profit before taxation at applicable tax rates (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
INCOME TAX EXPENSE CREDIT [Abstract]      
Loss before taxation ¥ (9,445) ¥ (418,465) ¥ (78,285)
Tax calculated at a tax rate of 25% (2,361) (104,616) (19,571)
Tax effect on non-deductible expenses 0 0 0
Tax effect on different tax rates of group entities operating in other jurisdictions 842 588 218
Impairment losses on property, plant and equipment, and investment property that are not tax deductible 0 20,191 8,817
Impairment losses on land use right that are not tax deductible 0 1,064 353
Inventory provision (reversal) that are not tax deductible (taxable) (14,192) 13,993 (683)
Bad debt allowance that are not tax deductible 17,165 79,057 6,232
Depreciation and amortization adjustments that are not tax deductible (18,050) (15,890) (15,617)
Other 29 0 0
Income tax refund that are not expected to receive 0 0 24,270
Net operating losses not recognized to deferred tax assets 16,623 5,822 5,722
Tax per financial statements ¥ 56 ¥ 209 ¥ 9,741