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Restricted Net Assets (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Restricted Net Assets      
Appropriation of after-tax income to general reserve fund or statutory surplus reserve fund (as a percentage) 10.00%    
Transfer of assets, restricted portion $ 35,940 ¥ 250,230 ¥ 269,070