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Fair Value Measurements (Details) (Fair Value, Measurements, Recurring, USD $) In Thousands, unless otherwise specified | Dec. 31, 2013
--- | ---
Liabilities: |
Contingent consideration | $ 7
Fair Value, Inputs, Level 3 |
Liabilities: |
Contingent consideration | $ 7

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares. + References No definition available. + Details
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Namespace Prefix: | zyxi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant