| Cover | Feb. 15, 2025 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Feb. 15, 2025 |
| Entity File Number | 1-37897 |
| Entity Registrant Name | RESHAPE LIFESCIENCES INC. |
| Entity Central Index Key | 0001427570 |
| Entity Tax Identification Number | 26-1828101 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 18 Technology Drive, Suite 110 |
| Entity Address, City or Town | Irvine |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 92618 |
| City Area Code | 949 |
| Local Phone Number | 429-6680 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common stock, $0.001 par value per share |
| Trading Symbol | RSLS |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
