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COMMITMENTS (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Operating Leased Assets [Line Items]    
Total rent expense $ 297,455us-gaap_OperatingLeasesRentExpenseNet $ 280,696us-gaap_OperatingLeasesRentExpenseNet
Future minimum annual rental payments and sub-lease income [Abstract]    
2015 85,444us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent  
2016 0us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears  
2017 0us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears  
2018 0us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears  
2019 0us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears  
Total 85,444us-gaap_OperatingLeasesFutureMinimumPaymentsDue  
Combined Production and Office Facility [Member]    
Operating Leased Assets [Line Items]    
Area of leased property (in sq. feet) 44,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
 
Required monthly rental payments $ 21,361ztho_RequiredMonthlyRentalPayments
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember