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WARRANTS (Schedule of Outstanding Warrants) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Mar. 18, 2009
Class of Warrant or Right [Line Items]          
No. of underlying shares 80,000,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights 160,000,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights 360,000,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights 80,000,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights  
Total fair value $ 5,548,000us-gaap_WarrantsAndRightsOutstanding $ 10,419,000us-gaap_WarrantsAndRightsOutstanding $ 14,889,000us-gaap_WarrantsAndRightsOutstanding    
Warrants issued in acquisition of game licenses       14,889,000us-gaap_NoncashOrPartNoncashAcquisitionNoncashFinancialOrEquityInstrumentConsiderationWarrantsIssued1    
Warrants exercised, (in shares) 40,000,000kz_StockIssuedDuringPeriodSharesExerciseOfWarrants 200,000,000kz_StockIssuedDuringPeriodSharesExerciseOfWarrants      
Proceeds from exercise of warrants 5,940,000us-gaap_ProceedsFromWarrantExercises 27,820,000us-gaap_ProceedsFromWarrantExercises       
NGP and Fit Run Limited [Member]          
Class of Warrant or Right [Line Items]          
Warrants exercised, (in shares)   80,000,000kz_StockIssuedDuringPeriodSharesExerciseOfWarrants
/ us-gaap_CounterpartyNameAxis
= kz_NgpAndFitRunLimitedMember
     
Proceeds from exercise of warrants   10,000,000us-gaap_ProceedsFromWarrantExercises
/ us-gaap_CounterpartyNameAxis
= kz_NgpAndFitRunLimitedMember
     
Other Warrant Holders [Member]          
Class of Warrant or Right [Line Items]          
Warrants exercised, (in shares) 40,000,000kz_StockIssuedDuringPeriodSharesExerciseOfWarrants
/ us-gaap_CounterpartyNameAxis
= kz_OtherWarrantHoldersMember
120,000,000kz_StockIssuedDuringPeriodSharesExerciseOfWarrants
/ us-gaap_CounterpartyNameAxis
= kz_OtherWarrantHoldersMember
     
Proceeds from exercise of warrants 5,940,000us-gaap_ProceedsFromWarrantExercises
/ us-gaap_CounterpartyNameAxis
= kz_OtherWarrantHoldersMember
17,800,000us-gaap_ProceedsFromWarrantExercises
/ us-gaap_CounterpartyNameAxis
= kz_OtherWarrantHoldersMember
     
Convertible Senior Note Warrants [Member]          
Class of Warrant or Right [Line Items]          
No. of underlying shares         80,000,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_ConvertibleSeniorNoteWarrantsMember
Warrant term   5 years      
Price per share         $ 0.125us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_ConvertibleSeniorNoteWarrantsMember
Total fair value         677,332us-gaap_WarrantsAndRightsOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_ConvertibleSeniorNoteWarrantsMember
Tranch 1 [Member]          
Class of Warrant or Right [Line Items]          
No. of underlying shares     120,000,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_TranchOneWarrantsMember
   
Price per share     $ 0.1485us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_TranchOneWarrantsMember
   
Fair value per warrant     $ 0.0372kz_ClassOfWarrantOrRightFairValuePerShare
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_TranchOneWarrantsMember
   
Total fair value     4,470,000us-gaap_WarrantsAndRightsOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_TranchOneWarrantsMember
   
Expected lives     1 year    
Tranch 2 [Member]          
Class of Warrant or Right [Line Items]          
No. of underlying shares     40,000,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_TranchTwoWarrantMember
   
Price per share     $ 0.1485us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_TranchTwoWarrantMember
   
Fair value per warrant     $ 0.0681kz_ClassOfWarrantOrRightFairValuePerShare
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_TranchTwoWarrantMember
   
Total fair value     2,723,000us-gaap_WarrantsAndRightsOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_TranchTwoWarrantMember
   
Expected lives     4 years    
Tranch 3 [Member]          
Class of Warrant or Right [Line Items]          
No. of underlying shares     40,000,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_TranchThreeWarrantsMember
   
Price per share     $ 0.1485us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_TranchThreeWarrantsMember
   
Fair value per warrant     $ 0.0837kz_ClassOfWarrantOrRightFairValuePerShare
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_TranchThreeWarrantsMember
   
Total fair value     3,346,000us-gaap_WarrantsAndRightsOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_TranchThreeWarrantsMember
   
Expected lives     5 years    
Tranch 4 [Member]          
Class of Warrant or Right [Line Items]          
No. of underlying shares     40,000,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_TranchFourWarrantsMember
   
Price per share     $ 0.1985us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_TranchFourWarrantsMember
   
Fair value per warrant     $ 0.0537kz_ClassOfWarrantOrRightFairValuePerShare
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_TranchFourWarrantsMember
   
Total fair value     2,148,000us-gaap_WarrantsAndRightsOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_TranchFourWarrantsMember
   
Expected lives     1 year 9 months 18 days    
Tranch 5 [Member]          
Class of Warrant or Right [Line Items]          
No. of underlying shares     40,000,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_TranchFiveWarrantsMember
   
Price per share     $ 0.1750us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_TranchFiveWarrantsMember
   
Fair value per warrant     $ 0.0550kz_ClassOfWarrantOrRightFairValuePerShare
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_TranchFiveWarrantsMember
   
Total fair value     $ 2,202,000us-gaap_WarrantsAndRightsOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_TranchFiveWarrantsMember
   
Expected lives     2 years 1 month 6 days    
Warrants Issued During 2012 [Member]          
Class of Warrant or Right [Line Items]          
No. of underlying shares     280,000,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_WarrantsIssuedDuring2012Member
   
Warrants issued in acquisition of game licenses     14,889,000us-gaap_NoncashOrPartNoncashAcquisitionNoncashFinancialOrEquityInstrumentConsiderationWarrantsIssued1
/ us-gaap_ClassOfWarrantOrRightAxis
= kz_WarrantsIssuedDuring2012Member