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CRYPTOCURRENCIES - Additional Information (Details)
¥ in Thousands
 12 Months Ended
Dec. 31, 2025
CNY (¥)
item
contract
Dec. 31, 2024
CNY (¥)
contract
item
Dec. 31, 2023
CNY (¥)
item
Dec. 31, 2022
item
Dec. 31, 2021
item
Dec. 31, 2025
USD ($)
item
Dec. 31, 2024
USD ($)
item
Dec. 31, 2023
USD ($)
item
Jan. 01, 2023
CNY (¥)
Jan. 01, 2023
USD ($)
Mar. 31, 2021
item
Crypto Asset, Activity [Line Items]                      
Increase in cryptocurrencies ¥ 252,206 ¥ 206,130 ¥ 107,961     $ 36,065,000          
Decrease in accumulated deficit (4,832,656) (4,430,210)       (691,061,000)          
Value of units pledged | ¥ 238,533 193,938                  
Cryptocurrencies, restricted-current ¥ 238,533 ¥ 193,938       34,110,000          
Number of pledged loan contracts signed | contract 8 6                  
Cumulative effect period of adoption                      
Crypto Asset, Activity [Line Items]                      
Increase in cryptocurrencies                 ¥ 1,500 $ 200,000  
Decrease in accumulated deficit                 ¥ 1,500 $ 200,000  
Filecoin Mining                      
Crypto Asset, Activity [Line Items]                      
Number of units owned   200,547         200,547        
Bitcoins                      
Crypto Asset, Activity [Line Items]                      
Increase in cryptocurrencies ¥ 238,886 ¥ 196,680       $ 34,160,000          
Number of units owned 387 287 306     387 287 306      
Less: Cryptocurrencies, restricted 386 273 38     386 273 38     110
Value of units pledged ¥ 238,500 ¥ 187,300 ¥ 11,400     $ 34,100,000 $ 26,800,000 $ 1,600,000      
Number of units pledged, current     30         30      
Cryptocurrencies, restricted-current     ¥ 9,100         $ 1,300,000      
Number of units pledged, non-current     8         8      
Cryptocurrencies, restricted non-current     ¥ 2,400         $ 300,000      
Number of units released   38 32 0 40            
Bitcoins | Loans Payable                      
Crypto Asset, Activity [Line Items]                      
Principal amount | $           25,100,000 $ 12,500,000        
Tether                      
Crypto Asset, Activity [Line Items]                      
Increase in cryptocurrencies ¥ 11,713 ¥ 2,154       $ 1,675,000          
Number of units owned 1,666,489         1,666,489 299,630        
Less: Cryptocurrencies, restricted 1,500,000         1,500,000         1,500,000
Number of units released       0 1,500,000            
Filecoin                      
Crypto Asset, Activity [Line Items]                      
Increase in cryptocurrencies | ¥   ¥ 7,296                  
Number of units owned 0 200,547       0 200,547        
Less: Cryptocurrencies, restricted   183,212         183,212        
Cryptocurrencies, restricted-current   ¥ 6,700         $ 1,000,000        
USD Coin                      
Crypto Asset, Activity [Line Items]                      
Increase in cryptocurrencies ¥ 1,607         $ 230,000          
Number of units owned 228,601 0       228,601 0