| Cover | Jan. 21, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jan. 21, 2021 |
| Entity File Number | 001-37717 |
| Entity Registrant Name | SENSEONICS HOLDINGS, INC. |
| Entity Central Index Key | 0001616543 |
| Entity Tax Identification Number | 47-1210911 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 20451 Seneca Meadows Parkway |
| Entity Address, City or Town | Germantown |
| Entity Address, State or Province | MD |
| Entity Address, Postal Zip Code | 20876-7005 |
| City Area Code | 301 |
| Local Phone Number | 515-7260 |
| 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 |
| Trading Symbol | SENS |
| Security Exchange Name | NYSEAMER |
| Entity Emerging Growth Company | false |
