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SHORT-TERM NONCONVERTIBLE NOTE PAYABLE TO RELATED PARTY (Details) (USD $)
3 Months Ended 0 Months Ended
Mar. 31, 2015
Sep. 29, 2014
Oct. 23, 2014
Oct. 30, 2014
Dec. 03, 2014
Dec. 31, 2014
Dec. 19, 2014
Short-term Debt [Line Items]              
Accrued and unpaid interest $ 103,623us-gaap_InterestPayableCurrent         $ 96,108us-gaap_InterestPayableCurrent  
Nonconvertible Note Member [Member] | Edward B. Smith [Member]              
Short-term Debt [Line Items]              
Interest rate on debt (in hundredths)             14.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ztho_DirectorAndShareholderMember
/ us-gaap_ShortTermDebtTypeAxis
= ztho_NonconvertibleNoteMemberMember
Maturity date Apr. 15, 2015            
Outstanding amount of non-convertible note 270,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ztho_DirectorAndShareholderMember
/ us-gaap_ShortTermDebtTypeAxis
= ztho_NonconvertibleNoteMemberMember
           
Accrued and unpaid interest 16,589us-gaap_InterestPayableCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ztho_DirectorAndShareholderMember
/ us-gaap_ShortTermDebtTypeAxis
= ztho_NonconvertibleNoteMemberMember
           
Nonconvertible Note Member 1 [Member] | Edward B. Smith [Member]              
Short-term Debt [Line Items]              
Notes payable to related parties   85,000us-gaap_NotesPayableRelatedPartiesClassifiedCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ztho_DirectorAndShareholderMember
/ us-gaap_ShortTermDebtTypeAxis
= ztho_NonconvertibleNoteMember1Member
         
Interest rate on debt (in hundredths)   14.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ztho_DirectorAndShareholderMember
/ us-gaap_ShortTermDebtTypeAxis
= ztho_NonconvertibleNoteMember1Member
         
Term of debt   2 months          
Maturity date Nov. 29, 2014            
Period considered to calculate interest rate   365 days          
Nonconvertible Note Member 2 [Member] | Edward B. Smith [Member]              
Short-term Debt [Line Items]              
Notes payable to related parties     85,000us-gaap_NotesPayableRelatedPartiesClassifiedCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ztho_DirectorAndShareholderMember
/ us-gaap_ShortTermDebtTypeAxis
= ztho_NonconvertibleNoteMember2Member
       
Interest rate on debt (in hundredths)     14.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ztho_DirectorAndShareholderMember
/ us-gaap_ShortTermDebtTypeAxis
= ztho_NonconvertibleNoteMember2Member
       
Term of debt     2 months        
Maturity date Dec. 23, 2014            
Period considered to calculate interest rate     365 days        
Nonconvertible Note Member 3 [Member] | Edward B. Smith [Member]              
Short-term Debt [Line Items]              
Notes payable to related parties       70,000us-gaap_NotesPayableRelatedPartiesClassifiedCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ztho_DirectorAndShareholderMember
/ us-gaap_ShortTermDebtTypeAxis
= ztho_NonconvertibleNoteMember3Member
     
Interest rate on debt (in hundredths)       14.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ztho_DirectorAndShareholderMember
/ us-gaap_ShortTermDebtTypeAxis
= ztho_NonconvertibleNoteMember3Member
     
Term of debt       2 months      
Maturity date Dec. 30, 2014            
Period considered to calculate interest rate       365 days      
Nonconvertible Note Member 4 [Member] | Edward B. Smith [Member]              
Short-term Debt [Line Items]              
Notes payable to related parties         $ 30,000us-gaap_NotesPayableRelatedPartiesClassifiedCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ztho_DirectorAndShareholderMember
/ us-gaap_ShortTermDebtTypeAxis
= ztho_NonconvertibleNoteMember4Member
   
Interest rate on debt (in hundredths)         14.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ztho_DirectorAndShareholderMember
/ us-gaap_ShortTermDebtTypeAxis
= ztho_NonconvertibleNoteMember4Member
   
Term of debt         2 months    
Maturity date Feb. 03, 2015            
Period considered to calculate interest rate         365 days