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PRINCIPAL ACCOUNTING POLICIES - Summary Of Expected Allowance For Credit Losses (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Allowance for Credit Loss [Abstract]      
Balance at beginning of year ¥ 13,089
Allowance for credit losses 24,045 13,089
Write-offs (24,630)    
Balance at end of year ¥ 12,504 ¥ 13,089