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DERIVATIVE LIABILITIES (Details) (USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Aug. 20, 2013
Aug. 20, 2013
Nov. 18, 2013
Sep. 18, 2013
Mar. 31, 2013
Feb. 28, 2013
DERIVATIVE LIABILITIES [Abstract]                
Interest rate on convertible notes (in hundredths) 8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage              
Change attributable to conversion of the preferred stock $ 0ztho_ChangeInDerivativeLiabilityDueToConversionOfPreferredStock $ 2,761,688ztho_ChangeInDerivativeLiabilityDueToConversionOfPreferredStock            
Change associated with the exercise of warrants 0ztho_ChangeInDerivativeLiabilityDueToExerciseOfWarrants 4,201,908ztho_ChangeInDerivativeLiabilityDueToExerciseOfWarrants            
Derivatives, Fair Value [Line Items]                
Derivative liabilities 20,166us-gaap_DerivativeLiabilitiesCurrent 95,049us-gaap_DerivativeLiabilitiesCurrent            
Derivative Liability [Roll Forward]                
Beginning Balance 95,049us-gaap_DerivativeLiabilitiesCurrent 8,025,381us-gaap_DerivativeLiabilitiesCurrent            
Bifurcated Amount 0us-gaap_EmbeddedDerivativeNoLongerBifurcatedAmountReclassifiedToStockholdersEquity 0us-gaap_EmbeddedDerivativeNoLongerBifurcatedAmountReclassifiedToStockholdersEquity            
Change in derivative liability valuation (74,883)ztho_ChangeInFairValueOfDerivativeLiability (966,736)ztho_ChangeInFairValueOfDerivativeLiability            
Change in derivative liability - settlements 0ztho_ChangeInDerivativeLiabilityConversion (6,963,596)ztho_ChangeInDerivativeLiabilityConversion            
Total 20,166us-gaap_DerivativeLiabilitiesCurrent 95,049us-gaap_DerivativeLiabilitiesCurrent            
Warrant exercise price (in dollars per share)           $ 1.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 $ 1.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 $ 1.25us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Warrants issued to purchase common stock (in shares)           234,286us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights    
Warrants issued 57,729us-gaap_ProceedsFromIssuanceOfWarrants              
Common Stock Warrants [Member]                
Derivatives, Fair Value [Line Items]                
Derivative liabilities 20,166us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember
95,049us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember
           
Derivative Liability [Roll Forward]                
Total 20,166us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember
95,049us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember
           
Embedded Conversion Features for Convertible Debt or Preferred Shares [Member]                
Derivatives, Fair Value [Line Items]                
Derivative liabilities 0us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember
0us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember
           
Derivative Liability [Roll Forward]                
Total 0us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember
0us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember
           
Derivative Liabilities [Member]                
Derivative Liability [Roll Forward]                
Share price (in dollars per share) $ 0.38us-gaap_SharePrice
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
$ 0.56us-gaap_SharePrice
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
           
Market capitalization 14,900,570us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
28,625,236us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
           
Projected volatility based on a historical value (in hundredths) 119.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
93.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
           
Probability of an event to default (in hundredths) 5.00%us-gaap_FairValueInputsProbabilityOfDefault
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
5.00%us-gaap_FairValueInputsProbabilityOfDefault
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
           
Percentage in probability of an event to default per month (in hundredths) 0.10%ztho_PercentageInProbabilityOfEventToDefaultPerMonth
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
0.10%ztho_PercentageInProbabilityOfEventToDefaultPerMonth
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
           
Warrant [Member]                
Derivative Liability [Roll Forward]                
Warrant exercise price (in dollars per share)     $ 1.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_WarrantMember
$ 1.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_WarrantMember
       
Exercise price of unexercised warrants (in dollars per share)     $ 1.25ztho_WarrantsExercisePriceAfterReduction
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_WarrantMember
$ 1.25ztho_WarrantsExercisePriceAfterReduction
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_WarrantMember
       
Unexercised warrants description     for every five warrants owned, each remaining holder of $1.50 Warrants received one additional warrant with an exercise price of $1.25.          
Base number of warrants considered for additional warrant (in shares)     5ztho_BaseNumberOfWarrantsConsideredForAdditionalWarrant
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_WarrantMember
         
Number of warrants that not exercised (in shares)       11,880,047ztho_NumberOfWarrantsThatNotExercised
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_WarrantMember
       
Warrants issued to purchase common stock (in shares)     2,376,009us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_WarrantMember
2,376,009us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_WarrantMember
       
Warrants issued (in shares)     2,316,597ztho_DebtInstrumentConvertibleNumberOfWarrantsIssued
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_WarrantMember
         
Settlement to additional paid in capital for related derivative liability     1,712,356ztho_SettlementToAdditionalPaidInCapitalForRelatedDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_WarrantMember
1,712,356ztho_SettlementToAdditionalPaidInCapitalForRelatedDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_WarrantMember
       
Common Stock [Member]                
Derivative Liability [Roll Forward]                
Share price (in dollars per share)         $ 0.75us-gaap_SharePrice
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommonStockMember
     
Warrant exercise price (in dollars per share)         $ 1.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommonStockMember
     
Warrants issued to purchase common stock (in shares)         1,400,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommonStockMember
     
Shares sold (in shares)         1,866,667us-gaap_StockIssuedDuringPeriodSharesIssuedForCash
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommonStockMember
     
Exercise of Warrants [Member]                
Derivative Liability [Roll Forward]                
Stock issued for conversions (in shares)   5,893,887us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits
/ us-gaap_StatementEquityComponentsAxis
= ztho_ExerciseOfWarrantsMember
           
Increase in additional paid in capital as a result of conversions   2,489,552us-gaap_StockIssuedDuringPeriodValueConversionOfUnits
/ us-gaap_StatementEquityComponentsAxis
= ztho_ExerciseOfWarrantsMember
           
Conversion of Series II Preferred Stock and Accrued Dividends [Member]                
Derivative Liability [Roll Forward]                
Stock issued for conversions (in shares)   3,859,697us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits
/ us-gaap_StatementEquityComponentsAxis
= ztho_ConversionOfSeriesIiPreferredStockAndAccruedDividendsMember
           
Increase in additional paid in capital as a result of conversions   $ 2,761,688us-gaap_StockIssuedDuringPeriodValueConversionOfUnits
/ us-gaap_StatementEquityComponentsAxis
= ztho_ConversionOfSeriesIiPreferredStockAndAccruedDividendsMember