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

Depreciation for assets held under capital Lease during the period.

No definition available.

Name:	staa_DepreciationForAssetsHeldUnderCapitalLease
Namespace Prefix:	staa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration