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Deferred Revenue and Customer Deposits (Details)
¥ in Thousands, $ in Thousands
Jun. 30, 2021
CNY (¥)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Revenue Recognition and Deferred Revenue [Abstract]      
Deferred revenue ¥ 70,166 $ 10,867 ¥ 71,141
Customer deposits 36,099 5,591 38,041
Total deferred revenue and customer deposits - current 106,265 16,458 109,182
Deferred revenue - non-current ¥ 5,233 $ 810 ¥ 6,049