| Document and Entity Information | Nov. 24, 2021 |
| Cover [Abstract] | |
| Entity Registrant Name | Battalion Oil Corp |
| Entity Central Index Key | 0001282648 |
| Document Type | 8-K |
| Document Period End Date | Nov. 24, 2021 |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-35467 |
| Entity Tax Identification Number | 20-0700684 |
| Entity Address, Address Line One | 3505 West Sam Houston Parkway North |
| Entity Address, Address Line Two | Suite 300 |
| Entity Address, City or Town | Houston |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 77043 |
| City Area Code | 832 |
| Local Phone Number | 538-0300 |
| Amendment Flag | false |
| Title of 12(b) Security | Common Stock par value $0.0001 |
| Trading Symbol | BATL |
| Security Exchange Name | NYSEAMER |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
