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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