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Commitments and Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 02, 2015
Loss Contingencies [Line Items]  
2015, Operating Leases $ 1,368us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
2016, Operating Leases 796us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
2017, Operating Leases 785us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
2018, Operating Leases 328us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
2019, Operating Leases 328us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
Thereafter,Operating Leases 244us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter
Operating Leases, Total minimum lease payments 3,849us-gaap_OperatingLeasesFutureMinimumPaymentsDue
Operating Leases, Less amounts representing Interest 0staa_OperatingLeasesFutureMinimumPaymentsInterestIncludedInPayments
Operating Leases Future Minimum Payments Present Value Of Net Minimum Payments 3,849staa_OperatingLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments
2015,Capital Leases 442us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent
2016,Capital Leases 348us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears
2017,Capital Leases 144us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears
2018,Capital Leases 0us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears
2019,Capital Leases 0us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears
Thereafter,Capital Leases 0us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter
Capital Leases, Total minimum lease payments 934us-gaap_CapitalLeasesFutureMinimumPaymentsDue
Capital Leases, Less amounts representing Interest 67us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments, Total $ 867us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments