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Investment in Associates - Summarized Investment in Associates (Detail) - Associates [member]
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2019
USD ($)
Disclosure of associates [line items]          
Share of loss of associates, net of tax ¥ 181 $ 26 ¥ 59 ¥ 28  
Carrying amount of investment ¥ 1,955   ¥ 2,130   $ 276