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Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data | Total | Convertible Preferred Stock | Common Stock | Additional Paid-in Capital | Treasury Stock | Accumulated Other Comprehensive Income (Loss) | Accumulated Deficit
--- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance, value at Dec. 31, 2011 | $ 22,426 us-gaap_StockholdersEquity | $ 5 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_ConvertiblePreferredStockMember | $ 92 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 42,032 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (1,078)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ (35)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (18,590)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Beginning Balance, shares at Dec. 31, 2011 |  | 500,000 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_ConvertiblePreferredStockMember | 8,917,824 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Issuance of common stock under stock option plan | 445 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised |  | 2 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 443 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Issuance of common stock under stock option plan, shares | 174,631 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  | 174,631 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Employee stock-based compensation expense | 396 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  |  | 396 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Release of restricted stock and escrow shares |  |  | 36,815 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Stock repurchase | (734)us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  | (734)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Stock repurchase, shares |  |  | (188,799)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Stock repurchased from tender offer, value | (2,101)irix_AdjustmentsToAdditionalPaidInCapitalStockRepurchasedFromTenderOfferValue |  |  | (2,101)irix_AdjustmentsToAdditionalPaidInCapitalStockRepurchasedFromTenderOfferValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Stock repurchased from tender offer, share |  |  | (487,500)irix_AdjustmentsToAdditionalPaidInCapitalStockRepurchasedFromTenderOfferShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Retirement of treasury stock |  |  |  | (1,812)us-gaap_TreasuryStockRetiredCostMethodAmount / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 1,812 us-gaap_TreasuryStockRetiredCostMethodAmount / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Foreign currency translation adjustments | 35 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax |  |  |  |  | 35 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Net income | 1,438 us-gaap_NetIncomeLoss |  |  |  |  |  | 1,438 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Ending Balance, value at Dec. 29, 2012 | 21,905 us-gaap_StockholdersEquity | 5 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_ConvertiblePreferredStockMember | 94 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 38,958 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (17,152)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Ending Balance, shares at Dec. 29, 2012 |  | 500,000 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_ConvertiblePreferredStockMember | 8,452,971 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Issuance of common stock under stock option plan | 1,495 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised |  | 5 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,490 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Issuance of common stock under stock option plan, shares | 493,622 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  | 493,622 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Employee stock-based compensation expense | 689 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  |  | 689 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Release of restricted stock and escrow shares |  |  | 27,915 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Stock repurchase | (426)us-gaap_TreasuryStockValueAcquiredCostMethod |  |  | (426)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Stock repurchase, shares |  |  | (75,025)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Stock repurchased from tender offer, value | (40)irix_AdjustmentsToAdditionalPaidInCapitalStockRepurchasedFromTenderOfferValue |  |  | (40)irix_AdjustmentsToAdditionalPaidInCapitalStockRepurchasedFromTenderOfferValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Preferred stock conversion to common stock |  | (5)us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_ConvertiblePreferredStockMember | 5 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Preferred stock conversion to common stock, share |  | (500,000)us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_ConvertiblePreferredStockMember | 1,000,000 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Net income | 2,231 us-gaap_NetIncomeLoss |  |  |  |  |  | 2,231 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Ending Balance, value at Dec. 28, 2013 | 25,854 us-gaap_StockholdersEquity |  | 104 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 40,671 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (14,921)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Ending Balance, shares at Dec. 28, 2013 |  |  | 9,899,483 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Issuance of common stock under stock option plan | 1,501 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised |  | 4 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,497 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Issuance of common stock under stock option plan, shares | 399,390 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  | 399,390 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Employee stock-based compensation expense | 972 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  |  | 972 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Excess tax benefits from stock-based awards | 36 us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet |  |  | 36 us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Release of restricted stock and escrow shares |  |  | 50,262 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Stock repurchase | (4,665)us-gaap_TreasuryStockValueAcquiredCostMethod |  |  | (4,665)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Stock repurchase, shares |  |  | (562,440)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Net income | 10,038 us-gaap_NetIncomeLoss |  |  |  |  |  | 10,038 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Ending Balance, value at Jan. 03, 2015 | $ 33,736 us-gaap_StockholdersEquity |  | $ 108 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 38,511 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | $ (4,883)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Ending Balance, shares at Jan. 03, 2015 |  |  | 9,786,695 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |

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