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Prepayments, Deposits, and Other Current Assets - Schedule Of Prepayments, Deposits, and Other Current Assets (Parenthetical) (Details) | Jun. 28, 2019 | Dec. 28, 2018
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Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract] |  |
Percent of prepayments deposits and other current assets included in other current assets | 5.00% | 5.00%

X
- Definition Percent of prepaid expenses deposits and other assets current. + References No definition available. + Details
Name: | staa_PercentOfPrepaidExpensesDepositsAndOtherAssetsCurrent
Namespace Prefix: | staa_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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