Quarterly report pursuant to Section 13 or 15(d)

Cover

v3.21.2
Cover - shares
 6 Months Ended
Jun. 30, 2021
Aug. 01, 2021
Cover [Abstract]    
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 001-39555  
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  
Trading Symbol GLSI  
Security Exchange Name NASDAQ  
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 Common Stock, Shares Outstanding   12,969,157