Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net loss	$ (6,231)us-gaap_ProfitLoss	$ (7,340)us-gaap_ProfitLoss
Adjustments to reconcile net loss to net cash provided (used) in operating activities:
Depreciation expense	613us-gaap_Depreciation	708us-gaap_Depreciation
Write-off non-core inventory	2,005us-gaap_InventoryWriteDown	1,340us-gaap_InventoryWriteDown
Write-off rental units	650zyxi_WriteoffOfRentalUnits
Net gain on lease termination	(2,195)us-gaap_GainLossOnContractTermination
Change in the value of contingent consideration		(94)
Provision for losses on accounts receivable	1,406us-gaap_ProvisionForDoubtfulAccounts	469us-gaap_ProvisionForDoubtfulAccounts
Amortization of intangible assets	47us-gaap_AmortizationOfIntangibleAssets	131us-gaap_AmortizationOfIntangibleAssets
Impairment of intangible assets		160
Impairment of goodwill		251us-gaap_GoodwillImpairmentLoss
Amortization of financing fees	48us-gaap_AmortizationOfFinancingCosts	50us-gaap_AmortizationOfFinancingCosts
Issuance of common stock for services	23
Provision for obsolete inventory	336zyxi_ProvisionForObsoleteInventory	97zyxi_ProvisionForObsoleteInventory
Deferred rent	391us-gaap_StraightLineRent	1,299us-gaap_StraightLineRent
Employee stock-based compensation expense	93us-gaap_ShareBasedCompensation	133us-gaap_ShareBasedCompensation
Deferred tax expense (benefit)		1,069us-gaap_DeferredIncomeTaxExpenseBenefit
Changes in operating assets and liabilities:
Accounts receivable	2,436	4,722
Inventory	726us-gaap_IncreaseDecreaseInInventories	(279)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses	96	(103)
Income tax receivable	625	(893)
Deposits and other current assets	122	(207)
Deferred revenue	112
Accounts payable	(199)	686
Accrued liabilities	(126)	(1,247)
Income taxes payable	(17)	(1,334)
Net cash used in operating activities	961	(382)
Cash flows from investing activities:
Purchases of equipment and inventory used for rental	(272)	(644)
Change in inventory used for rental	285	764
Payments on contingent consideration	(3)zyxi_PaymentsOnContingentConsideration	(3)zyxi_PaymentsOnContingentConsideration
Net cash provided by investing activities	10	117
Cash flows from financing activities:
Net repayments on line of credit	(1,378)	(86)
Proceeds from notes payable and capital leases	207
Payments on notes payable and capital lease obligations	(60)	(149)
Net cash used by financing activities	(1,231)	(235)
Net decrease in cash	(260)	(500)
Cash at the beginning of the period	323us-gaap_Cash	823us-gaap_Cash
Cash at the end of the period	63us-gaap_Cash	323us-gaap_Cash
Supplemental cash flow information:
Interest paid	536us-gaap_InterestPaid	561us-gaap_InterestPaid
Income taxes paid (including interest and penalties)		399us-gaap_IncomeTaxesPaid
Supplemental disclosure of non-cash investing and financing activities:
Deposit used to purchase leasehold improvements	$ 311us-gaap_FairValueOfAssetsAcquired

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- Definition

The net cash inflow or cash outflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-Subparagraph c

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

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- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4K

-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591552-111686

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 45

-Paragraph 19

-URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4J

-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686

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- Definition

Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

+ References

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- Definition

The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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- Definition

Difference between actual rental income due and rental income recognized on a straight-line basis.

+ References

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- Details

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- Definition

Increase decrease in deposit assets and other current assets.

+ References

No definition available.

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- Definition

Payments on contingent consideration.

+ References

No definition available.

+ Details

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- Definition

Provision for obsolete inventory.

+ References

No definition available.

+ Details

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- Definition

Writeoff of rental units.

+ References

No definition available.

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