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Intangible Assets, Net - Additional information (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2022
CNY (¥)
Intangible Assets, Net        
Amortization of intangible assets ¥ 128 $ 18 ¥ 138 ¥ 139
Amortization expenses related to intangible assets, each year 118      
Amortization expenses related to intangible assets, thereafter 0      
Impairment for intangible assets ¥ 24,268   ¥ 0 ¥ 0