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SHORT-TERM NONCONVERTIBLE NOTE PAYABLE TO RELATED PARTY (Details) (USD $)
0 Months Ended
Dec. 19, 2014
Dec. 03, 2014
Oct. 30, 2014
Oct. 23, 2014
Sep. 29, 2014
Dec. 31, 2014
Dec. 31, 2013
Short-term Debt [Line Items]              
Interest rate on debt (in hundredths)           8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage  
Accrued interest           $ 96,108us-gaap_InterestPayableCurrent $ 0us-gaap_InterestPayableCurrent
Nonconvertible Note Member [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_NonconvertibleNoteMemberMember
70,000us-gaap_NotesPayableRelatedPartiesClassifiedCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ztho_DirectorAndShareholderMember
/ us-gaap_ShortTermDebtTypeAxis
= ztho_NonconvertibleNoteMemberMember
85,000us-gaap_NotesPayableRelatedPartiesClassifiedCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ztho_DirectorAndShareholderMember
/ us-gaap_ShortTermDebtTypeAxis
= ztho_NonconvertibleNoteMemberMember
85,000us-gaap_NotesPayableRelatedPartiesClassifiedCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ztho_DirectorAndShareholderMember
/ us-gaap_ShortTermDebtTypeAxis
= ztho_NonconvertibleNoteMemberMember
   
Interest rate on debt (in hundredths) 14.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ztho_DirectorAndShareholderMember
/ us-gaap_ShortTermDebtTypeAxis
= ztho_NonconvertibleNoteMemberMember
14.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ztho_DirectorAndShareholderMember
/ us-gaap_ShortTermDebtTypeAxis
= ztho_NonconvertibleNoteMemberMember
14.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ztho_DirectorAndShareholderMember
/ us-gaap_ShortTermDebtTypeAxis
= ztho_NonconvertibleNoteMemberMember
14.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ztho_DirectorAndShareholderMember
/ us-gaap_ShortTermDebtTypeAxis
= ztho_NonconvertibleNoteMemberMember
14.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ztho_DirectorAndShareholderMember
/ us-gaap_ShortTermDebtTypeAxis
= ztho_NonconvertibleNoteMemberMember
   
Term of debt   2 months 2 months 2 months 2 months    
Maturity date Apr. 15, 2015 Feb. 03, 2015 Dec. 30, 2014 Dec. 23, 2014 Nov. 29, 2014    
Period considered to calculate interest rate   365 days 365 days 365 days 365 days    
Outstanding amount of non-convertible note           270,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ztho_DirectorAndShareholderMember
/ us-gaap_ShortTermDebtTypeAxis
= ztho_NonconvertibleNoteMemberMember
 
Accrued interest           $ 7,268us-gaap_InterestPayableCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ztho_DirectorAndShareholderMember
/ us-gaap_ShortTermDebtTypeAxis
= ztho_NonconvertibleNoteMemberMember