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ACQUISITION OF NOUMENA (Details) (USD $)
Share data in Millions, unless otherwise specified
0 Months Ended 12 Months Ended
Mar. 20, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Total consideration estimated at acquisition date:        
ADS ratio     0.025dei_EntityListingDepositoryReceiptRatio  
Purchase price allocation:        
Goodwill   $ 90,019,108us-gaap_Goodwill $ 90,266,629us-gaap_Goodwill  
Noumena [Member]        
Total consideration estimated at acquisition date:        
Cash consideration 14,880,600kz_BusinessCombinationConsiderationTransferredCashPaidAndLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= kz_NoumenaMember
     
Fair value of ordinary shares issued (determined based on the market closing price of the Company's ADSs at the acquisition date after lock up discount) 4,230,000us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ us-gaap_BusinessAcquisitionAxis
= kz_NoumenaMember
     
Total 19,110,600us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= kz_NoumenaMember
     
Cash paid during period   2,880,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= kz_NoumenaMember
3,000,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= kz_NoumenaMember
9,000,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= kz_NoumenaMember
Acquisition-related costs 77,783us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= kz_NoumenaMember
     
Revenues       2,946,157us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= kz_NoumenaMember
Net income       2,074,536us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= kz_NoumenaMember
Purchase price allocation:        
Tangible assets acquired (including cash of $586,701) 669,600kz_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= kz_NoumenaMember
     
Acquired intangible assets 3,487,524us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= kz_NoumenaMember
     
Goodwill 14,953,476us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= kz_NoumenaMember
     
Total 19,110,600us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= kz_NoumenaMember
     
Cash $ 586,701us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= kz_NoumenaMember
     
Noumena [Member] | Common Stock [Member]        
Total consideration estimated at acquisition date:        
Number of shares issued in business acquisition 40us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= kz_NoumenaMember
/ us-gaap_EquityInterestIssuedOrIssuableByTypeAxis
= us-gaap_CommonStockMember
     
Noumena [Member] | American Depositary Shares [Member]        
Total consideration estimated at acquisition date:        
Number of shares issued in business acquisition 1us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= kz_NoumenaMember
/ us-gaap_EquityInterestIssuedOrIssuableByTypeAxis
= kz_AmericanDepositarySharesMember
     
Noumena [Member] | Product Technologies [Member]        
Purchase price allocation:        
Amortization period   3 years