| Cover | Mar. 04, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Mar. 4, 2021 |
| Entity Registrant Name | SI-BONE, INC. |
| Entity Central Index Key | 0001459839 |
| Amendment Flag | false |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-38701 |
| Entity Tax Identification Number | 26-2216351 |
| Entity Address, Address Line One | 471 El Camino Real |
| Entity Address, Address Line Two | Suite 101 |
| Entity Address, City or Town | Santa Clara |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 95050 |
| City Area Code | 408 |
| Local Phone Number | 207-0700 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.0001 per share |
| Trading Symbol | SIBN |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
