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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
segments
Dec. 31, 2013
segments
Dec. 31, 2012
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]      
Number of reporting units 3us-gaap_NumberOfReportingUnits 3us-gaap_NumberOfReportingUnits  
Sales taxes $ (333,622)us-gaap_ExciseAndSalesTaxes $ 5,786,615us-gaap_ExciseAndSalesTaxes $ 5,793,557us-gaap_ExciseAndSalesTaxes
Statement [Line Items]      
Impairment loss on intangible assets 1,323,260us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill 1,812,939us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill   
Impairment loss on cost method investment 1,999,999us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment 2,000,000us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment   
Government subsidies 1,138,909us-gaap_OtherOperatingIncome 2,176,449us-gaap_OtherOperatingIncome 301,359us-gaap_OtherOperatingIncome
Advertising expenses $ 5,726,530us-gaap_AdvertisingExpense $ 8,412,925us-gaap_AdvertisingExpense $ 5,802,006us-gaap_AdvertisingExpense
Minimum [Member]      
Statement [Line Items]      
Service fees paid, percent 15.00%kz_ServiceFeesPaidPercentOfGrossRevenuesLessBadDebts
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Maximum [Member]      
Statement [Line Items]      
Service fees paid, percent 70.00%kz_ServiceFeesPaidPercentOfGrossRevenuesLessBadDebts
/ us-gaap_RangeAxis
= us-gaap_MaximumMember