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Acquisition - Schedule of allocation of purchase price (Parenthetical) (Details)
¥ in Millions, $ in Millions
Apr. 01, 2019
CNY (¥)
Apr. 01, 2019
USD ($)
Dec. 28, 2018
CNY (¥)
Dec. 28, 2018
USD ($)
Yitian Xindong        
Acquisition        
Cash and cash equivalents acquired     ¥ 10.9 $ 1.6
Tianbo        
Acquisition        
Cash and cash equivalents acquired ¥ 175.5 $ 25.2