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Segment Reporting (Details Textual)
12 Months Ended
Dec. 31, 2014
Segment
Segment Reporting Information [Line Items]  
Number of reporting segments 1us-gaap_NumberOfReportableSegments
Total net revenue | ZMI Tens units and compound pain creams  
Segment Reporting Information [Line Items]  
Concentration Risk, Percentage 96.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_StatementBusinessSegmentsAxis
= zyxi_ZMITENSUnitsAndCompoundPainCreamsMember