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DEFERRED TAX ASSETS/(LIABILITIES) - TAX LOSS CARRY-FORWARDS AND OTHER TEMPORARY DIFFERENCES (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2020
Dec. 31, 2019
DEFERRED TAX ASSETS/(LIABILITIES) [abstract]    
Tax losses that can be carried forward (a) ¥ 235,403 ¥ 142,469
Deductible temporary differences 12,302 12,452
Total tax loss carry-forwards and deductible temporary differences ¥ 247,705 ¥ 154,921