Annual report [Section 13 and 15(d), not S-K Item 405]

Cover

v3.25.1
Cover - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2024
Apr. 11, 2025
Jun. 28, 2024
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2024    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2024    
Current Fiscal Year End Date --12-31    
Entity File Number 001-39555    
Entity Registrant Name GREENWICH LIFESCIENCES, INC.    
Entity Central Index Key 0001799788    
Entity Tax Identification Number 20-5473709    
Entity Incorporation, State or Country Code DE    
Entity Address, Address Line One 3992 Bluebonnet Dr.    
Entity Address, Address Line Two Building 14    
Entity Address, City or Town Stafford    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 77477    
City Area Code (832)    
Local Phone Number 819-3232    
Title of 12(b) Security Common Stock, $0.001 par value    
Trading Symbol GLSI    
Security Exchange Name NASDAQ    
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 true    
Elected Not To Use the Extended Transition Period false    
Entity Shell Company false    
Entity Public Float     $ 101
Entity Common Stock, Shares Outstanding   13,273,539  
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Listing, Par Value Per Share $ 0.001    
Auditor Name RBSM LLP    
Auditor Location Houston, Texas    
Auditor Firm ID 587