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Related Party Transactions (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Related Party Transactions (Textual) [Abstract]
Lump sum payment made under retirement agreement	$ 90
Consultation agreement period	24 months
Payment of Advisory fees	8
Cancellation of consulting agreement	30 days
Consulting expense	$ 96	$ 86

X

- Definition

Consultation agreement cancellation period.

+ References

No definition available.

+ Details

Name:	zyxi_ConsultationAgreementCancellationPeriod
Namespace Prefix:	zyxi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Consultation agreement period.

+ References

No definition available.

+ Details

Name:	zyxi_ConsultationAgreementPeriod
Namespace Prefix:	zyxi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Consultation expenses.

+ References

No definition available.

+ Details

Name:	zyxi_ConsultationExpenses
Namespace Prefix:	zyxi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Payment of advisory fees.

+ References

No definition available.

+ Details

Name:	zyxi_PaymentOfAdvisoryFees
Namespace Prefix:	zyxi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Related party transaction lump sum payment under retirement agreement.

+ References

No definition available.

+ Details

Name:	zyxi_RelatedPartyTransactionLumpSumPaymentUnderRetirementAgreement
Namespace Prefix:	zyxi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	zyxi_RelatedPartyTransactionsTextualAbstract
Namespace Prefix:	zyxi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration