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Restricted Net Assets (Details) - 12 months ended Dec. 31, 2018
¥ in Thousands, $ in Thousands
USD ($)
CNY (¥)
Restricted Net Assets    
Minimum percentage of after tax profit to be allocated to general reserve 10.00%  
Limit of general reserve fund as a percentage of registered capital, after which allocations to general reserve fund are no longer required 50.00%  
Restricted net assets of Company's PRC subsidiaries, the VIE and subsidiary of the VIE $ 183,619 ¥ 1,262,472