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Income Taxes (Details Textual) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Income Taxes [Line Items]    
Statutory rate (34.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate (34.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Net loss for income tax purpose $ 3,200zyxi_NetIncomeLossForIncomeTaxPurpose  
State    
Income Taxes [Line Items]    
Net operating loss carry forwards $ 6,700us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		  
Minimum    
Income Taxes [Line Items]    
Net operating loss carry forwards, expiration period (in years) 5 years  
Maximum    
Income Taxes [Line Items]    
Net operating loss carry forwards, expiration period (in years) 7 years