| Cover | Nov. 19, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Nov. 19, 2021 |
| Current Fiscal Year End Date | --12-31 |
| Entity File Number | 001-31812 |
| Entity Registrant Name | ANI PHARMACEUTICALS, INC. |
| Entity Central Index Key | 0001023024 |
| Entity Tax Identification Number | 58-2301143 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 210 Main Street West |
| Entity Address, City or Town | Baudette |
| Entity Address, State or Province | MN |
| Entity Address, Postal Zip Code | 56623 |
| City Area Code | 218 |
| Local Phone Number | 634-3500 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | ANIP |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
