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Stock-Based Compensation (Details 1) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Apr. 03, 2015 | Apr. 04, 2014
Schedule of Employee Service Share-based Compensation [Line Items] |  |
Total stock compensation expense | $ 994 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1 | $ 1,500 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1
Amounts capitalized as part of inventory | 122 staa_CompensationCostCapitalised | 78 staa_CompensationCostCapitalised
Total | 1,116 us-gaap_AllocatedShareBasedCompensationExpense | 1,578 us-gaap_AllocatedShareBasedCompensationExpense
General and administrative [Member] |  |
Schedule of Employee Service Share-based Compensation [Line Items] |  |
Total stock compensation expense | 593 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1 / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember | 928 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1 / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember
Marketing and selling [Member] |  |
Schedule of Employee Service Share-based Compensation [Line Items] |  |
Total stock compensation expense | 251 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1 / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember | 302 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1 / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember
Research and development [Member] |  |
Schedule of Employee Service Share-based Compensation [Line Items] |  |
Total stock compensation expense | $ 150 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1 / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember | $ 270 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1 / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Amount of capitalized and expensed compensation cost from equity-based compensation arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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