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Fair Value Measurement - Quantitative Information about the Inputs and Valuation Methodologies Used for Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Jan. 03, 2015 | Dec. 28, 2013
Earn Out Liability |  |
Quantitative information about the inputs and valuation methodologies used for fair value measurements |  |
Liabilities, Fair Value Measurements | 1,423 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByLiabilityClassAxis = irix_EarnOutLiabilityMember | 624 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByLiabilityClassAxis = irix_EarnOutLiabilityMember
Level 3 | Earn Out Liability |  |
Quantitative information about the inputs and valuation methodologies used for fair value measurements |  |
Liabilities, Fair Value Measurements | 1,423 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByLiabilityClassAxis = irix_EarnOutLiabilityMember | 624 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByLiabilityClassAxis = irix_EarnOutLiabilityMember
Level 3 | Discounted Cash Flow |  |
Quantitative information about the inputs and valuation methodologies used for fair value measurements |  |
Valuation Technique, Earn-out liability | Discounted cash flow | Discounted cash flow
Level 3 | Discounted Cash Flow | Weighted Average |  |
Quantitative information about the inputs and valuation methodologies used for fair value measurements |  |
Weighted Average, Projected royalties | 3,048 irix_FairValueInputsProjectedRoyaltiesAmount / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = irix_DiscountedCashFlowMember | 1,463 irix_FairValueInputsProjectedRoyaltiesAmount / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = irix_DiscountedCashFlowMember
Weighted Average, Discount rate | 13.54%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = irix_DiscountedCashFlowMember | 21.61%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = irix_DiscountedCashFlowMember
Level 3 | Discounted Cash Flow | Minimum |  |
Quantitative information about the inputs and valuation methodologies used for fair value measurements |  |
Weighted Average, Projected royalties | 669 irix_FairValueInputsProjectedRoyaltiesAmount / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = irix_DiscountedCashFlowMember | 414 irix_FairValueInputsProjectedRoyaltiesAmount / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = irix_DiscountedCashFlowMember
Weighted Average, Discount rate | 10.34%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = irix_DiscountedCashFlowMember | 20.52%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = irix_DiscountedCashFlowMember
Level 3 | Discounted Cash Flow | Maximum |  |
Quantitative information about the inputs and valuation methodologies used for fair value measurements |  |
Weighted Average, Projected royalties | 3,613 irix_FairValueInputsProjectedRoyaltiesAmount / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = irix_DiscountedCashFlowMember | 1,675 irix_FairValueInputsProjectedRoyaltiesAmount / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = irix_DiscountedCashFlowMember
Weighted Average, Discount rate | 27.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = irix_DiscountedCashFlowMember | 27.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = irix_DiscountedCashFlowMember
Level 3 | Discounted Cash Flow | Earn Out Liability |  |
Quantitative information about the inputs and valuation methodologies used for fair value measurements |  |
Liabilities, Fair Value Measurements | 1,423 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByLiabilityClassAxis = irix_EarnOutLiabilityMember / us-gaap_ValuationTechniqueAxis = irix_DiscountedCashFlowMember | 624 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByLiabilityClassAxis = irix_EarnOutLiabilityMember / us-gaap_ValuationTechniqueAxis = irix_DiscountedCashFlowMember

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- Definition Fair value inputs projected royalties amount. + References No definition available. + Details
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- Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + 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 (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Description of the inputs and valuation technique(s) used to measure fair value. + 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 (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity. + References No definition available. + Details
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Period Type: | instant

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- Details
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- Details
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