| Cover Page | Nov. 04, 2021 | Aug. 17, 2021 |
| Cover [Abstract] | ||
| Document Type | 8-K | |
| Document Period End Date | Nov. 4, 2021 | |
| Entity Registrant Name | ANTARES PHARMA, INC. | |
| Entity Central Index Key | 0001016169 | |
| Amendment Flag | false | |
| Entity Incorporation, State or Country Code | DE | |
| Entity File Number | 001-32302 | |
| Entity Tax Identification Number | 41-1350192 | |
| Entity Address, Address Line One | 100 Princeton South | |
| Entity Address, Address Line Two | Suite 300 | |
| Entity Address, City or Town | Ewing | |
| Entity Address, State or Province | NJ | |
| Entity Address, Postal Zip Code | 08628 | |
| City Area Code | 609 | |
| Local Phone Number | 359-3020 | |
| 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 $0.01 per share | |
| Trading Symbol | ATRS | |
| Security Exchange Name | NASDAQ | |
| Entity Emerging Growth Company | false |
