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Leases - Summary of Carrying Amounts of Lease Liabilities and Movements During Years (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Presentation of leases for lessee [abstract]      
Beginning balance ¥ 17,490 ¥ 14,713  
Additions 2,734 5,682  
Accretion of interest 1,082 2,561 ¥ 613
Covid-19 - related rent concessions from a lessor 0 (778) 0
Lease termination (14,379) 0  
Payments (3,648) (4,688)  
Ending balance 3,279 17,490 ¥ 14,713
Current 2,486 7,660  
Non-current ¥ 793 ¥ 9,830