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Commitments and Contingencies - Schedule of Depreciation Expense for Assets Under Capital Lease (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 28, 2018 | Dec. 29, 2017 | Dec. 30, 2016
Commitments And Contingencies Disclosure [Abstract] |  |  |
Depreciation expense | $ 760 | $ 580 | $ 220

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- Definition Depreciation for assets held under capital Lease during the period. + References No definition available. + Details
Name: | staa_DepreciationForAssetsHeldUnderCapitalLease
Namespace Prefix: | staa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration