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Employee Benefit Plans - Additional Information (Details) | 12 Months Ended
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Jan. 01, 2021 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Description Related To Benefit Based Under Point System | Each point earned is worth a fixed monetary value, 1,000 Yen per point, regardless of the level grade or zone of the employee. Gross benefits are calculated based on the cumulative number of points earned over the service period multiplied by 1,000 Yen. The mandatory retirement age limit is 60 years old
Defined Contribution Plan Employees Eligible Payroll | $ 19,500
Defined Contribution Plan Employees Catch-up Contribution | $ 6,500
Employers Contribution Percentage | 80.00%
Employee’s Contribution up to First Percentage of Employee’s Compensation | 6.00%
Swiss Plan |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Future Estimated Cash Contribution | $ 775,000

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- Definition Defined contribution plan employees catch-up contribution. + References No definition available. + Details
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Namespace Prefix: | staa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Defines Employees' eligible payroll under defined contribution plan. + References No definition available. + Details
Name: | staa_DefinedContributionPlanEmployeesEligiblePayroll
Namespace Prefix: | staa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Defines method of point system benefits. + References No definition available. + Details
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Namespace Prefix: | staa_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Description of estimated cash contribution for future period. + References No definition available. + Details
Name: | staa_FutureEstimatedCashContribution
Namespace Prefix: | staa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |