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Income Taxes - Movements of Valuation Allowance of Deferred Tax Assets (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Movements of valuation allowance of deferred tax assets        
Balance at beginning of the year ¥ 60,628   ¥ 56,653  
Provided 20,275   24,196 ¥ 56,653
Addition due to acquisition 193,826      
Write off (2,916)   (20,221) (15,651)
Balance at end of the year ¥ 271,813 $ 42,653 ¥ 60,628 ¥ 56,653