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Accounts Receivable, Net - Schedule of Analysis of Allowance for Doubtful Accounts (Detail)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2014
CNY
Dec. 31, 2013
CNY
Receivables [Abstract]      
Beginning balance $ 202us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent 1,253us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent 1,161us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Additions charged to bad debt expense 56us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease 348us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease 251us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease
Reversal (49)us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries (306)us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries 0us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries
Write off (155)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs (960)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs (159)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Ending balance $ 54us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent 335us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent 1,253us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent