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Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	Jan. 02, 2015	Jan. 03, 2014
Current deferred tax assets (liabilities):
Allowance for doubtful accounts and sales returns	$ 127us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	$ 21us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Inventories	511us-gaap_DeferredTaxAssetsInventory	11us-gaap_DeferredTaxAssetsInventory
Accrued vacation	397staa_Deferredtaxassetsaccruedvacation	375staa_Deferredtaxassetsaccruedvacation
State taxes	0us-gaap_DeferredTaxAssetsStateTaxes	0us-gaap_DeferredTaxAssetsStateTaxes
Accrued other expenses	119us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLegalSettlements	105us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLegalSettlements
Other	80staa_Deferredtaxassetsliabilitiesothercurrent	(137)staa_Deferredtaxassetsliabilitiesothercurrent
Valuation allowance	(939)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent	(741)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent
Total current deferred tax assets (liabilities)	295us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent	(366)us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Non-current deferred tax assets (liabilities):
Net operating loss carryforwards	53,747us-gaap_DeferredTaxAssetsOperatingLossCarryforwards	50,409us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Stock-based compensation	1,684us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	2,212us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Business, foreign and AMT credit carryforwards	1,223us-gaap_DeferredTaxAssetsTaxCreditCarryforwards	921us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Capitalized R&D	423us-gaap_DeferredTaxAssetsInProcessResearchAndDevelopment	525us-gaap_DeferredTaxAssetsInProcessResearchAndDevelopment
Contributions	37us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther	57us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther
Pensions	489us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	731us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions
Depreciation and amortization	870us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment	360us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Foreign tax withholding	(1,326)staa_DeferredTaxLiabilitiesTaxCreditCarryforwardsForeign	(1,129)staa_DeferredTaxLiabilitiesTaxCreditCarryforwardsForeign
Foreign earnings not permanently reinvested	(5,022)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings	(4,992)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings
Other	31staa_Deferredtaxassetsliabilitiesothernoncurrent	(40)staa_Deferredtaxassetsliabilitiesothernoncurrent
Valuation allowance	(53,165)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent	(50,082)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent
Total non-current deferred tax liabilities	$ (1,009)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent	$ (1,028)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent

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