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Significant Accounting Policies - Principles of consolidation to short-term investments (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Principles of consolidation      
Net loss attributable to non-controlling interests ¥ (1,038) ¥ 889 ¥ (156)
Functional currency and foreign currency translation      
Total foreign currency translation adjustments (1,090) (4,843) ¥ (3,285)
Fair value measurements      
Impairment loss 0    
Recurring      
Fair value measurements      
Short-term investments-Wealth management products 119,140 148,344  
Level 2 | Recurring      
Fair value measurements      
Short-term investments-Wealth management products ¥ 119,140 ¥ 148,344