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MAJOR CUSTOMERS AND CREDIT CONCENTRATION (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Customer
Dec. 31, 2014
Concentration Risk [Line Items]    
Deposits that exceeded the federally insured limits 0ztho_DepositsThatExceededFederallyInsuredLimits $ 777,713ztho_DepositsThatExceededFederallyInsuredLimits
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member]    
Concentration Risk [Line Items]    
Number of customers above risk benchmark 3ztho_NumberOfCustomersAboveRiskBenchmark
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
 
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member] | Customer One [Member]    
Concentration Risk [Line Items]    
Concentration risk (in hundredths) 35.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= ztho_CustomerOneMember
 
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member] | Customer Two [Member]    
Concentration Risk [Line Items]    
Concentration risk (in hundredths) 13.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= ztho_CustomerTwoMember
 
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member] | Customer Three [Member]    
Concentration Risk [Line Items]    
Concentration risk (in hundredths) 9.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= ztho_CustomerThreeMember
 
Accounts Receivable [Member] | Customer Concentration Risk [Member]    
Concentration Risk [Line Items]    
Number of customers above risk benchmark 3ztho_NumberOfCustomersAboveRiskBenchmark
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
 
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer One [Member]    
Concentration Risk [Line Items]    
Concentration risk (in hundredths) 30.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= ztho_CustomerOneMember
 
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Two [Member]    
Concentration Risk [Line Items]    
Concentration risk (in hundredths) 12.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= ztho_CustomerTwoMember
 
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Three [Member]    
Concentration Risk [Line Items]    
Concentration risk (in hundredths) 11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= ztho_CustomerThreeMember