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DEFERRED TAX ASSETS/(LIABILITIES) - TAX LOSS CARRY-FORWARDS AND OTHER TEMPORARY DIFFERENCES (Details) - CNY (¥)
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets and liabilities [abstract]    
Tax losses that can be carried forward (a) ¥ 306,669,000 ¥ 235,403,000
Deductible temporary differences 16,809,000 28,047,000
Total tax loss carry-forwards and deductible temporary differences ¥ 323,478,000 ¥ 263,450,000