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Income Taxes (Details 1)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Schedule of reconciliation of income tax    
Statutory rate (34.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate (34.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State taxes (2.00%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes (3.00%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Permanent differences and other 2.00%zyxi_EffectiveIncomeTaxRateReconciliationPermanentDifferencesAndOtherAdjustments 3.00%zyxi_EffectiveIncomeTaxRateReconciliationPermanentDifferencesAndOtherAdjustments
Change in valuation allowance 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 24.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Effective rate 0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations (10.00%)us-gaap_EffectiveIncomeTaxRateContinuingOperations