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Commitments and Contingencies - Future Minimum Lease Payments Under Finance Lease Together With Present Value of Net Minimum Lease Payments (Detail)
¥ in Thousands, $ in Thousands
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Disclosure of finance lease and operating lease by lessee [line items]      
Minimum lease payments $ 7 ¥ 48 ¥ 79
Present value of payments 7 48 79
One year or less [member]      
Disclosure of finance lease and operating lease by lessee [line items]      
Minimum lease payments 2 14 33
Present value of payments 2 14 33
After one year but not more than five years [member]      
Disclosure of finance lease and operating lease by lessee [line items]      
Minimum lease payments 5 34 46
Present value of payments $ 5 ¥ 34 ¥ 46