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Other Income and Expenses - Summary of Finance Income (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Profit or loss [abstract]      
Bank interest income ¥ 34 ¥ 45 ¥ 155
Interest income on loans receivable   1,527  
Interest income on net investments in subleases 45 49 103
Total finance income ¥ 79 ¥ 1,621 ¥ 258