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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Mar. 03, 2022
Jun. 30, 2021
Cover [Abstract]      
Entity Registrant Name Battalion Oil Corp    
Entity Central Index Key 0001282648    
Document Type 10-K    
Document Period End Date Dec. 31, 2021    
Document Annual Report true    
Document Transition Report false    
Amendment Flag false    
Trading Symbol BATL    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Entity Shell Company false    
Entity Public Float     $ 49.9
Entity Common Stock, Shares Outstanding   16,337,030  
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Entity Incorporation, State or Country Code DE    
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    
Title of 12(b) Security Common Stock par value $0.0001    
Security Exchange Name NYSEAMER    
Entity File Number 001-35467    
Auditor Name DELOITTE & TOUCHE LLP    
Auditor Firm ID 34    
Auditor Location Houston, Texas