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Deferred Revenue and Customer Deposits (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Revenue Recognition and Deferred Revenue [Abstract]          
Deferred revenue ¥ 80,405 $ 12,617 ¥ 71,141    
Customer deposits 39,586 6,212 38,041 $ 5,969 ¥ 37,923
Total deferred revenue and customer deposits - current 119,991 18,829 109,182    
Deferred revenue - non-current ¥ 3,845 $ 603 ¥ 6,049