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Property and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Property Plant And Equipment [Line Items]    
Property and Equipment, Gross $ 2,496us-gaap_PropertyPlantAndEquipmentGross $ 2,536us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation (1,356)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (1,260)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and Equipment, Net 1,140us-gaap_PropertyPlantAndEquipmentNet 1,276us-gaap_PropertyPlantAndEquipmentNet
Office furniture and equipment    
Property Plant And Equipment [Line Items]    
Property and Equipment, Gross 917us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
917us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
Office furniture and equipment | Minimum    
Property Plant And Equipment [Line Items]    
Property and Equipment, Useful Life 3 years  
Office furniture and equipment | Maximum    
Property Plant And Equipment [Line Items]    
Property and Equipment, Useful Life 7 years  
Rental inventory    
Property Plant And Equipment [Line Items]    
Property and Equipment, Gross 1,274us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= zyxi_RentalInventoryMember
1,314us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= zyxi_RentalInventoryMember
Property and Equipment, Useful Life 5 years  
Vehicles    
Property Plant And Equipment [Line Items]    
Property and Equipment, Gross 76us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember
76us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember
Property and Equipment, Useful Life 5 years  
Leasehold improvements    
Property Plant And Equipment [Line Items]    
Property and Equipment, Gross 104us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
104us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
Leasehold improvements | Minimum    
Property Plant And Equipment [Line Items]    
Property and Equipment, Useful Life 2 years  
Leasehold improvements | Maximum    
Property Plant And Equipment [Line Items]    
Property and Equipment, Useful Life 6 years  
Assembly equipment    
Property Plant And Equipment [Line Items]    
Property and Equipment, Gross $ 125us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
$ 125us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
Property and Equipment, Useful Life 7 years