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Line of Credit (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Line of Credit Facility [Abstract]    
Line of credit $ 4,538us-gaap_LinesOfCreditCurrent $ 4,442us-gaap_LinesOfCreditCurrent
Date of Maturity Dec. 19, 2014  
Revolving Credit Facility    
Line of Credit Facility [Abstract]    
Line of credit 4,538us-gaap_LinesOfCreditCurrent
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
 
Remaining amount available for borrowing $ 0us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
 
Effective interest rate under the Credit Agreement 11.64%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
 
Interest rate 6.75%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
 
Additional default interest rate 3.00%zyxi_PortionOfAdditionalDefaultInterestRateInEffectiveInterestRate
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
 
Fees include in effective interest rate under the credit agreement 1.89%us-gaap_LineOfCreditFacilityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember