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INCOME TAXES (Details 4)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2014
CNY
Dec. 31, 2013
CNY
Dec. 31, 2014
HONG KONG
Dec. 31, 2014
Maximum
USD ($)
Dec. 31, 2014
Maximum
CNY
Dec. 31, 2013
Maximum
CNY
Dec. 31, 2014
Minimum
USD ($)
Dec. 31, 2014
Minimum
CNY
Dec. 31, 2013
Minimum
CNY
Dec. 31, 2014
Foreign
USD ($)
Dec. 31, 2014
Foreign
CNY
Deferred tax assets, current portion                        
Deferred revenue $ 105cmcm_DeferredTaxAssetsDeferredIncomeCurrent 656cmcm_DeferredTaxAssetsDeferredIncomeCurrent 393cmcm_DeferredTaxAssetsDeferredIncomeCurrent                  
Provision for doubtful debts 623us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 3,866us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 2,202us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts                  
Tax loss carry forward 2,515cmcm_DeferredTaxAssetsOperatingLossCarryForwardsCurrent 15,600cmcm_DeferredTaxAssetsOperatingLossCarryForwardsCurrent 597cmcm_DeferredTaxAssetsOperatingLossCarryForwardsCurrent                  
Others 111us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther 686us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther 356us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther                  
Less: Valuation allowance (2,920)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent (18,115)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent (1,635)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent                  
Current deferred tax assets 434us-gaap_DeferredTaxAssetsNetCurrent 2,693us-gaap_DeferredTaxAssetsNetCurrent 1,913us-gaap_DeferredTaxAssetsNetCurrent                  
Deferred tax assets, non-current portion                        
Deferred revenue 18cmcm_DeferredTaxAssetsDeferredIncomeNoncurrent 111cmcm_DeferredTaxAssetsDeferredIncomeNoncurrent 673cmcm_DeferredTaxAssetsDeferredIncomeNoncurrent                  
Intangible assets and prepaid expense 710cmcm_DeferredTaxAssetsIntangibleAssetsAndPrepaidExpense 4,403cmcm_DeferredTaxAssetsIntangibleAssetsAndPrepaidExpense 5,303cmcm_DeferredTaxAssetsIntangibleAssetsAndPrepaidExpense                  
Foreign tax credit 155us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign 960us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign 659us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign                  
Equity investment loss 226us-gaap_DeferredTaxAssetsEquityMethodInvestments 1,402us-gaap_DeferredTaxAssetsEquityMethodInvestments                    
Contingency consideration 336cmcm_DeferredTaxAssetsContingencyConsiderationNoncurrent 2,085cmcm_DeferredTaxAssetsContingencyConsiderationNoncurrent                    
Tax loss carry forward 1,298cmcm_DeferredTaxAssetsOperatingLossCarryForwardsNoncurrent 8,051cmcm_DeferredTaxAssetsOperatingLossCarryForwardsNoncurrent 8,959cmcm_DeferredTaxAssetsOperatingLossCarryForwardsNoncurrent                  
Others 104cmcm_DeferredTaxAssetsTaxDeferredExpenseOtherNonCurrent 650cmcm_DeferredTaxAssetsTaxDeferredExpenseOtherNonCurrent 546cmcm_DeferredTaxAssetsTaxDeferredExpenseOtherNonCurrent                  
Less: Valuation allowance (1,818)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent (11,278)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent (8,962)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent                  
Non-current deferred tax assets 1,029us-gaap_DeferredTaxAssetsNetNoncurrent 6,384us-gaap_DeferredTaxAssetsNetNoncurrent 7,178us-gaap_DeferredTaxAssetsNetNoncurrent                  
Deferred tax liabilities, non-current portion                        
Long-lived assets arising from acquisitions 2,621cmcm_DeferredTaxLiabilitiesLonglivedAssetsArisingFromAcquisitions 16,259cmcm_DeferredTaxLiabilitiesLonglivedAssetsArisingFromAcquisitions 1,122cmcm_DeferredTaxLiabilitiesLonglivedAssetsArisingFromAcquisitions                  
Unrealized gains from available-for-sale equity security     4,174cmcm_DeferredTaxLiabilitiesUnrealizedGainsOnAvailableForSaleSecurities                  
Outside basis difference 8,015cmcm_DeferredTaxLiabilitiesOutsideBasisDifference 49,732cmcm_DeferredTaxLiabilitiesOutsideBasisDifference 33,910cmcm_DeferredTaxLiabilitiesOutsideBasisDifference                  
Total deferred tax liabilities 10,636us-gaap_DeferredTaxLiabilitiesNoncurrent 65,991us-gaap_DeferredTaxLiabilitiesNoncurrent 39,206us-gaap_DeferredTaxLiabilitiesNoncurrent                  
Components of the deferred tax assets and liabilities                        
Total deferred tax assets before valuation allowances 6,201us-gaap_DeferredTaxAssetsGross 38,470us-gaap_DeferredTaxAssetsGross 19,688us-gaap_DeferredTaxAssetsGross                  
Valuation allowances 4,738us-gaap_DeferredTaxAssetsValuationAllowance 29,393us-gaap_DeferredTaxAssetsValuationAllowance 10,597us-gaap_DeferredTaxAssetsValuationAllowance                  
Undistributed earnings 52,574us-gaap_UndistributedEarningsOfDomesticSubsidiaries 326,199us-gaap_UndistributedEarningsOfDomesticSubsidiaries 37,251us-gaap_UndistributedEarningsOfDomesticSubsidiaries                  
Tax Withheld   0cmcm_TaxWithheld                    
Tax withheld rate 10.00%cmcm_PercentageOfTaxWithholdRate 10.00%cmcm_PercentageOfTaxWithholdRate                    
Reduced withholding tax rate       5cmcm_ReducedTaxWithheldRateWhenTreatyBenefitIsApplicable
/ dei_LegalEntityAxis
= country_HK
               
Unrecognized deferred income tax liabilities         5,257cmcm_UnrecognizedDeferredIncomeTaxLiabilities
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
32,620cmcm_UnrecognizedDeferredIncomeTaxLiabilities
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
3,725cmcm_UnrecognizedDeferredIncomeTaxLiabilities
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
2,629cmcm_UnrecognizedDeferredIncomeTaxLiabilities
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
16,310cmcm_UnrecognizedDeferredIncomeTaxLiabilities
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
1,863cmcm_UnrecognizedDeferredIncomeTaxLiabilities
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Net operating losses carryforwards 20,550us-gaap_OperatingLossCarryforwards 127,507us-gaap_OperatingLossCarryforwards                    
Foreign tax credit carryforwards                     $ 155us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
960us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember