Quarterly report pursuant to Section 13 or 15(d)

Cover

v3.21.2
Cover - shares
6 Months Ended
Jun. 30, 2021
Aug. 01, 2021
Entity Addresses [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Jun. 30, 2021  
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2021  
Current Fiscal Year End Date --12-31  
Entity File Number 001-39717  
Entity Registrant Name LIXTE BIOTECHNOLOGY HOLDINGS, INC.  
Entity Central Index Key 0001335105  
Entity Tax Identification Number 20-2903526  
Entity Incorporation, State or Country Code DE  
Entity Address, Address Line One 680 East Colorado Boulevard  
Entity Address, Address Line Two Suite 180  
Entity Address, City or Town Pasadena  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 91101  
City Area Code (631)  
Local Phone Number 830-7092  
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  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   13,746,593
Common Stock, par value $0.0001 per share [Member]    
Entity Addresses [Line Items]    
Title of 12(b) Security Common Stock, par value $0.0001 per share  
Trading Symbol LIXT  
Security Exchange Name NASDAQ  
Warrants to Purchase Common Stock, par value $0.0001 per share [Member]    
Entity Addresses [Line Items]    
Title of 12(b) Security Warrants to Purchase Common Stock, par value $0.0001 per share  
Trading Symbol LIXTW  
Security Exchange Name NASDAQ  
Former Address [Member]    
Entity Addresses [Line Items]    
Entity Address, Address Line One 248 Route 25A  
Entity Address, Address Line Two No. 2  
Entity Address, City or Town East Setauket  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 11733