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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)
$ / shares in Units, ¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 30, 2021
$ / shares
Dec. 07, 2021
CNY (¥)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2021
USD ($)
Jan. 01, 2020
CNY (¥)
Jan. 01, 2018
CNY (¥)
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]                  
Sale leaseback, Transaction amount     ¥ 110,000       $ 17,261    
Noon buying rate 6.3726                
Conversion from noon buying rate to per share value | $ / shares $ 1.00                
Description of Items to be Classified as Cash Equivalents     90 90          
Net loss from continuing operations     ¥ 522,672 $ (82,020) ¥ 404,029 ¥ 352,092      
Net cash (used in ) generated from operating activities     (359,313) (56,387) (229,766) (195,347)      
Interest Costs Incurred     139,873 21,949 148,642 110,319      
Interest and other costs relating to construction capitalized     66,084 10,370 67,283 81,619      
Impairment on long-lived assets     0 $ 0 8,500 ¥ 76,089      
Cash and cash equivalents     157,386   334,264   24,697    
Working capital     220,046       34,529    
Accumulated deficit     (3,277,270)   ¥ (2,456,649)   $ (514,275)    
Cash inflows from convertible bonds   ¥ 20,000 ¥ 20,000            
Minimum                  
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]                  
Lessor, Sales-type Lease, Term of Contract     5 years       5 years    
Maximum                  
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]                  
Lessor, Sales-type Lease, Term of Contract     20 years       20 years    
Offices and facility under leases | Minimum                  
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]                  
Lessee, Operating Lease, Term of Contract     1 year       1 year    
Lessee, Finance Lease, Term of Contract     1 year       1 year    
Offices and facility under leases | Maximum                  
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]                  
Lessee, Finance Lease, Term of Contract     20 years       20 years    
Land use rights under leases                  
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]                  
Lessee, Operating Lease, Term of Contract     50 years       50 years    
Lessee, Finance Lease, Term of Contract     50 years       50 years    
Equipment leased to others | Minimum                  
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]                  
Lessor, Sales-type Lease, Term of Contract     5 years       5 years    
Equipment leased to others | Maximum                  
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]                  
Lessor, Sales-type Lease, Term of Contract     20 years       20 years    
Cumulative Effect, Period of Adoption, Adjusted Balance                  
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]                  
Accumulated deficit                 ¥ 5,600
Cumulative Effect, Period of Adoption, Adjustment | ASU 2016-13                  
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]                  
Accumulated deficit               ¥ 1,223