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Other Income and Expenses - Summary of Other Income, Net (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Other Income And Expenses [Line Items]      
Total other income, net ¥ 8,700 ¥ 4,385 ¥ 3,830
Government Grants      
Other Income And Expenses [Line Items]      
Total other income, net 3,963 1,218 1,054
Covid 19 Related Rent Concessions from a Lessor      
Other Income And Expenses [Line Items]      
Total other income, net   778  
Foreign Exchange Differences, Net      
Other Income And Expenses [Line Items]      
Total other income, net (1,032) 361 1,173
Additional Deduction of VAT      
Other Income And Expenses [Line Items]      
Total other income, net 502 1,864 684
Bad Debt Recovery      
Other Income And Expenses [Line Items]      
Total other income, net 5,201   200
Others      
Other Income And Expenses [Line Items]      
Total other income, net ¥ 66 ¥ 164 ¥ 719