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PRINCIPAL RISKS (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
PRINCIPAL RISKS              
Cost of purchased materials ¥ 3,198,552 $ 501,923 ¥ 1,995,380 ¥ 1,623,324      
Credit risk | PRC              
PRINCIPAL RISKS              
Cash and cash equivalents and short-term investments 3,402,915   4,902,826 5,358,181 $ 533,991    
Credit risk | Outside PRC              
PRINCIPAL RISKS              
Cash and cash equivalents and short-term investments ¥ 3,074,721       $ 482,491 $ 23,478 $ 1,098
Supplier A | Total cost of purchased materials              
PRINCIPAL RISKS              
Cost of purchased materials     196,886 ¥ 265,014      
Supplier D | Total cost of purchased materials              
PRINCIPAL RISKS              
Cost of purchased materials     ¥ 194,838        
Economic risk              
PRINCIPAL RISKS              
Minimum term of PRC government's economic reform policies (in years) 20 years 20 years          
Foreign currency exchange rate risk              
PRINCIPAL RISKS              
(Depreciation) / Appreciation of US$ against RMB (2.30%) (2.30%) (6.30%) 1.30%