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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, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CNY (¥)
Disclosure of finance lease and operating lease by lessee [Line Items]      
Minimum lease payments ¥ 79 $ 12 ¥ 113
Present value of payments 79 12 108
Less: Amount representing finance charges [1] [1] (5)
One Year or Less [Member]      
Disclosure of finance lease and operating lease by lessee [Line Items]      
Minimum lease payments 33 5 43
Present value of payments 33 5 38
After one year but not more than five years [Member]      
Disclosure of finance lease and operating lease by lessee [Line Items]      
Minimum lease payments 46 7 70
Present value of payments ¥ 46 $ 7 ¥ 70
[1] Less than RMB 1 (US$1)