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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional information (Details)
$ / shares in Units, ¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2025
CNY (¥)
Dec. 31, 2025
USD ($)
$ / shares
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2025
USD ($)
Jan. 01, 2018
CNY (¥)
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES              
Net loss from continuing operations ¥ 379,420 $ (54,256) ¥ 652,075   ¥ 531,021    
Net cash (used in) generated from operating activities (201,824) $ (28,861) (397,749)   (276,471)    
Cash and cash equivalents 297,787   216,224     $ 42,583  
Working capital 1,012,497         144,785  
Accumulated deficit ¥ (4,465,643)   (4,372,832)     $ (638,578)  
Noon buying rate 6.9931         6.9931  
Conversion from noon buying rate to per share value | $ / shares   $ 1          
Description of liquid investments maturity term 90 days 90 days          
Goodwill impairment charges ¥ 0 $ 0 0 $ 0 0    
Interest costs incurred 203,456 29,094 249,534   223,936    
Interest and other costs relating to construction capitalized 51,130 $ 7,311 56,334   58,267    
Impairment on long-lived assets ¥ 0   ¥ 0   ¥ 0    
Minimum              
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES              
Lessor, sales-type lease, term of contract 5 years         5 years  
Maximum              
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES              
Lessor, sales-type lease, term of contract 20 years         20 years  
Offices and facility under leases | Minimum              
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES              
Lessee, finance lease, term of contract 1 year         1 year  
Lessee, operating lease, term of contract 1 year         1 year  
Offices and facility under leases | Maximum              
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES              
Lessee, finance lease, term of contract 20 years         20 years  
Land use rights under leases              
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES              
Lessee, finance lease, term of contract 50 years         50 years  
Lessee, operating lease, term of contract 50 years         50 years  
Equipment leased to others | Minimum              
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES              
Lessor, sales-type lease, term of contract 5 years         5 years  
Equipment leased to others | Maximum              
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES              
Lessor, sales-type lease, term of contract 20 years         20 years  
Cumulative effect, period of adoption, adjusted balance              
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES              
Accumulated deficit             ¥ 5,632