XML 90 R77.htm IDEA: XBRL DOCUMENT v3.3.1.900

Employee Benefit Plan (Details)	Feb. 02, 2007
Postemployment Benefits [Abstract]
Postemployment benefit, attained age	21 years

X

- References

No definition available.

+ Details

Name:	us-gaap_PostemploymentBenefitsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Defined Contribution Plan, Attained Age

+ References

No definition available.

+ Details

Name:	zgnx_DefinedContributionPlanAttainedAge
Namespace Prefix:	zgnx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration