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Significant Accounting Policies (Details Textual) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Equity and Noncontrolling interest |  | 20.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners |
Allowance for uncollectible accounts receivable |  | $ 936 us-gaap_AllowanceForDoubtfulAccountsReceivable | $ 1,837 us-gaap_AllowanceForDoubtfulAccountsReceivable
Deferred revenue |  | 112 us-gaap_DeferredRevenueCurrent | 0 us-gaap_DeferredRevenueCurrent
Write-off non-core inventory |  | 2,005 us-gaap_InventoryWriteDown | 1,340 us-gaap_InventoryWriteDown
Inventory finished goods |  | 2,364 us-gaap_InventoryFinishedGoods | 5,120 us-gaap_InventoryFinishedGoods
Inventory parts |  | 171 us-gaap_OtherInventoriesSpareParts | 310 us-gaap_OtherInventoriesSpareParts
Inventory supplies |  | 316 us-gaap_InventoryRawMaterialsAndSupplies | 850 us-gaap_InventoryRawMaterialsAndSupplies
Reserve for obsolete and damaged inventory |  | 916 us-gaap_InventoryValuationReserves | 1,278 us-gaap_InventoryValuationReserves
Increase in reserve for obsolete and damaged inventory |  | The Company now estimates that finished units held for sale will be reserved beginning in year three and fully reserved after four years compared to five years previously. |
Increase in reserve for obsolete and damaged inventory |  | 414 us-gaap_InventoryAdjustments |
Cost of revenue - Sales |  | 4,185 us-gaap_CostOfGoodsSold | 6,767 us-gaap_CostOfGoodsSold
Open purchase commitments |  | 270 zyxi_InventoryPurchaseCommitments |
Write-off rental units | 650 zyxi_WriteoffOfRentalUnits | 650 zyxi_WriteoffOfRentalUnits |
Advertising expense |  | 47 us-gaap_AdvertisingExpense | 115 us-gaap_AdvertisingExpense
Research and development expense |  | 394 us-gaap_ResearchAndDevelopmentExpense | 754 us-gaap_ResearchAndDevelopmentExpense
Company accrued unrecognized tax benefits, penalties and interest |  | 250 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 194 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Software and development costs |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Amortization Life Years |  | 5 years |
Inventory Valuation and Obsolescence |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Cost of revenue - Sales |  | $ 460 us-gaap_CostOfGoodsSold / us-gaap_ChangeInAccountingEstimateByTypeAxis = us-gaap_InventoryValuationAndObsolescenceMember |
Increase in cost of revenue per share |  | $ 0.02 zyxi_CostOfSalesPerShare / us-gaap_ChangeInAccountingEstimateByTypeAxis = us-gaap_InventoryValuationAndObsolescenceMember |

X
- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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- Definition Total costs related to goods produced and sold during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 2 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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