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COMMITMENTS - Capital commitments expenditures contracted (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other property, plant and equipment [member]      
Disclosure of commitments [Line Items]      
Authorised capital commitments but not contracted for ¥ 0 ¥ 0 ¥ 0
Chengdu Future      
Disclosure of commitments [Line Items]      
Contractual capital commitments ¥ 30,000,000 ¥ 0 ¥ 0