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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Adoption of ASU) (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Jan. 01, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Liabilities [Abstract]            
Deferred tax liabilities $ 23,764 ¥ 165,438 ¥ 165,646      
SHAREHOLDERS' EQUITY            
Accumulated deficit $ (256,474) ¥ (1,785,517) ¥ (1,232,991)      
Accounting Standards Update 2016-16 [Member]            
Liabilities [Abstract]            
Deferred tax liabilities           ¥ (5,632)
SHAREHOLDERS' EQUITY            
Accumulated deficit           ¥ 5,632
Previously Reported [Member]            
Liabilities [Abstract]            
Deferred tax liabilities         ¥ 73,577  
SHAREHOLDERS' EQUITY            
Accumulated deficit         ¥ (879,393)  
Restatement Adjustment [Member]            
Liabilities [Abstract]            
Deferred tax liabilities       ¥ 67,945    
SHAREHOLDERS' EQUITY            
Accumulated deficit       ¥ (873,761)