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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 $ 600,000us-gaap_OperatingLeasesRentExpenseMinimumRentals $ 600,000us-gaap_OperatingLeasesRentExpenseMinimumRentals $ 600,000us-gaap_OperatingLeasesRentExpenseMinimumRentals
Lease expiration date Feb. 28, 2017    
Annual minimum purchase commitment 750,000us-gaap_LongTermPurchaseCommitmentAmount    
Purchases made under agreement 678,000irix_AmountOfPurchasesMadeUnderAgreement    
Deficient amount under purchase agreement 72,000irix_DeficientAmountUnderPurchaseAgreement    
Royalties pay equivalent to Percentage of sales 5.00%irix_PercentageOfRoyaltyPaidOnNetSales    
Royalty expense $ 200,000us-gaap_RoyaltyExpense $ 100,000us-gaap_RoyaltyExpense $ 100,000us-gaap_RoyaltyExpense
Early termination date of certain license agreement 2018    
Late termination date of certain license agreement 2021