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Retirement Plan (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 Age | Dec. 31, 2012
Retirement Plan (Textual) [Abstract] |  |
Defined contribution plan eligibility age | 18 |
Defined contribution plan period of employment for eligibility | 3 months |
Contribution by the company towards the plan | $ 0 | $ 0

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Defined contribution plan eligibility age. + References No definition available. + Details
Name: | zyxi_DefinedContributionPlanEligibilityAge
Namespace Prefix: | zyxi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined contribution plan period of employment for eligibility. + References No definition available. + Details
Name: | zyxi_DefinedContributionPlanPeriodOfEmploymentForEligibility
Namespace Prefix: | zyxi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | zyxi_RetirementPlanTextualAbstract
Namespace Prefix: | zyxi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration