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TAXATION - Components of deferred taxes (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Deferred tax assets      
Donation ¥ 4,075 $ 639 ¥ 1,613
Accrued expenses 31,843 4,997 40,189
Accrued welfare 14,538 2,281 833
Impairment loss of long-lived assets and investments 303,168 47,574 317,846
Allowance for doubtful accounts 22,577 3,543 21,122
Tax losses 1,441,091 226,139 1,359,044
Valuation allowance (1,114,351) (174,866) (1,101,927)
Total deferred tax assets, net 702,941 110,307 638,720
Accumulated tax losses 5,943,276 932,630  
Valuation allowance ¥ 1,114,351 $ 174,866 ¥ 1,101,927