Prepayments, Deposits, and Other Current Assets - Schedule Of Prepayments, Deposits, and Other Current Assets (Parenthetical) (Details)	Oct. 02, 2020	Jan. 03, 2020
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%

Percent of prepaid expenses deposits and other assets current.

No definition available.

Name:	staa_PercentOfPrepaidExpensesDepositsAndOtherAssetsCurrent
Namespace Prefix:	staa_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant