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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 29, 2016 | Jan. 02, 2016 | Jan. 03, 2015 | Dec. 28, 2013
Commitments and Contingencies [Line Items] |  |  |  |
Rent expense |  | $ 800 | $ 600 | $ 600
Lease expiration date |  | Feb. 28, 2017 |  |
Annual minimum purchase commitment |  | $ 750 |  |
Royalties pay equivalent to Percentage of sales |  | 5.00% |  |
Royalty expense |  | $ 100 | $ 200 | $ 100
Early termination date of certain license agreement |  | 2018 |  |
Late termination date of certain license agreement |  | 2021 |  |
Fourth Amendment to Lease | Subsequent Event |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Lease expiration date | Feb. 28, 2019 |  |  |

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- Definition Commitments and contingencies. + References No definition available. + Details
Name: | irix_CommitmentsAndContingenciesLineItems
Namespace Prefix: | irix_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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

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- 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

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- 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

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- 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

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

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- 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 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=7661868&loc=d3e34039-112682 Reference 3: 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 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |