| Document And Entity Information | May 05, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | May 5, 2021 |
| Entity Registrant Name | STAAR Surgical Co |
| Entity Central Index Key | 0000718937 |
| Entity Emerging Growth Company | false |
| Entity File Number | 0-11634 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 95-3797439 |
| Entity Address, Address Line One | 25651 Atlantic Ocean Drive |
| Entity Address, City or Town | Lake Forest |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 92630 |
| City Area Code | 626 |
| Local Phone Number | 303-7902 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of each class | Common |
| Trading Symbol(s) | STAA |
| Name of each exchange on which registered | NASDAQ |
