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Fair Value Measurements (Details Textual) (USD $) In Thousands, unless otherwise specified | 0 Months Ended
--- | ---
Apr. 30, 2014
Fair Value Measurements [Abstract] |
Contingent payments | $ 4

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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 Payment for contingent consideration. + References No definition available. + Details
Name: | zyxi_PaymentForContingentConsideration
Namespace Prefix: | zyxi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration