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Fair Value Measurements (Details) (Fair Value, Measurements, Recurring, Contingent Consideration, USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Liabilities:
Contingent consideration	$ 4us-gaap_LiabilitiesFairValueDisclosure
Fair Value, Inputs, Level 3
Liabilities:
Contingent consideration	$ 4us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByLiabilityClassAxis = zyxi_BusinessAcquisitionContingentConsiderationMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember

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- Definition

Fair value of financial and nonfinancial obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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