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WARRANTS (Assumptions Used) (Details)
12 Months Ended
Dec. 31, 2012
Tranch 1 [Member]  
Class of Warrant or Right [Line Items]  
Risk-fee rate of return 0.952%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_TranchOneWarrantsMember
Expected remaining contractual lives of the warrants 1 year
Volatility 63.20%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_TranchOneWarrantsMember
Expected dividend yield   
Tranch 2 [Member]  
Class of Warrant or Right [Line Items]  
Risk-fee rate of return 1.674%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_TranchTwoWarrantMember
Expected remaining contractual lives of the warrants 4 years
Volatility 58.50%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_TranchTwoWarrantMember
Expected dividend yield   
Tranch 3 [Member]  
Class of Warrant or Right [Line Items]  
Risk-fee rate of return 1.916%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_TranchThreeWarrantsMember
Expected remaining contractual lives of the warrants 5 years
Volatility 66.60%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_TranchThreeWarrantsMember
Expected dividend yield   
Tranch 4 [Member]  
Class of Warrant or Right [Line Items]  
Risk-fee rate of return 1.185%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_TranchFourWarrantsMember
Expected remaining contractual lives of the warrants 1 year 9 months 18 days
Volatility 56.60%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_TranchFourWarrantsMember
Expected dividend yield   
Tranch 5 [Member]  
Class of Warrant or Right [Line Items]  
Risk-fee rate of return 1.186%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_TranchFiveWarrantsMember
Expected remaining contractual lives of the warrants 2 years 1 month 6 days
Volatility 54.50%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_TranchFiveWarrantsMember
Expected dividend yield