v3.26.1
Cover - shares
 6 Months Ended
Jun. 30, 2026
Jul. 28, 2026
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2026  
Document Transition Report false  
Entity File Number 001-43327  
Registrant Name Liftoff Mobile, Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 86-1817506  
Entity Address, Address Line One 900 Middlefield Road  
Entity Address, City or Town Redwood City  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 94063  
City Area Code 650  
Local Phone Number 319-7151  
Title of 12(b) Security Common stock, par value $0.0001 per share  
Trading Symbol LFTO  
Security Exchange Name NASDAQ  
Entity Current Reporting Status No  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   169,331,527
Central Index Key 0001850351  
Amendment Flag false  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Current Fiscal Year End Date --12-31