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Commitments and Contingencies (Details Textual) (USD $) | 12 Months Ended
--- | ---
Jan. 03, 2015 | Dec. 28, 2013 | Dec. 29, 2012
Commitments And Contingencies Disclosure [Abstract] |  |  |
Lease renewal period | 6 years |  |
Rent expense | $ 600,000 us-gaap_OperatingLeasesRentExpenseMinimumRentals | $ 600,000 us-gaap_OperatingLeasesRentExpenseMinimumRentals | $ 600,000 us-gaap_OperatingLeasesRentExpenseMinimumRentals
Lease expiration date | Feb. 28, 2017 |  |
Annual minimum purchase commitment | 750,000 us-gaap_LongTermPurchaseCommitmentAmount |  |
Purchases made under agreement | 678,000 irix_AmountOfPurchasesMadeUnderAgreement |  |
Deficient amount under purchase agreement | 72,000 irix_DeficientAmountUnderPurchaseAgreement |  |
Royalties pay equivalent to Percentage of sales | 5.00%irix_PercentageOfRoyaltyPaidOnNetSales |  |
Royalty expense | $ 200,000 us-gaap_RoyaltyExpense | $ 100,000 us-gaap_RoyaltyExpense | $ 100,000 us-gaap_RoyaltyExpense
Early termination date of certain license agreement | 2018 |  |
Late termination date of certain license agreement | 2021 |  |

X
- Definition Amount of purchases made under agreement. + References No definition available. + Details
Name: | irix_AmountOfPurchasesMadeUnderAgreement
Namespace Prefix: | irix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Deficient amount under purchase agreement. + References No definition available. + Details
Name: | irix_DeficientAmountUnderPurchaseAgreement
Namespace Prefix: | irix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Early termination year of license agreement. + References No definition available. + Details
Name: | irix_EarlyTerminationYearOfLicenseAgreement
Namespace Prefix: | irix_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Late termination year of license agreement. + References No definition available. + Details
Name: | irix_LateTerminationYearOfLicenseAgreement
Namespace Prefix: | irix_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Operating lease additional lease period. + References No definition available. + Details
Name: | irix_OperatingLeaseAdditionalLeasePeriod
Namespace Prefix: | irix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of royalty paid on net sales. + References No definition available. + Details
Name: | irix_PercentageOfRoyaltyPaidOnNetSales
Namespace Prefix: | irix_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date which lease or group of leases is set to expire, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_LeaseExpirationDate1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
Name: | us-gaap_LongTermPurchaseCommitmentAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This element represents the payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=7661868&loc=d3e34039-112682 + Details
Name: | us-gaap_OperatingLeasesRentExpenseMinimumRentals
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of expense related to royalty payments under a contractual arrangement such as payment for mineral and drilling rights and use of technology or intellectual property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
Name: | us-gaap_RoyaltyExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration