XML 11 R1.htm IDEA: XBRL DOCUMENT v3.21.1
Document and Entity Information - shares
 3 Months Ended
Mar. 31, 2021
Apr. 29, 2021
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2021  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q1  
Current Fiscal Year End Date --12-31  
Document Quarterly Report true  
Document Transition Report false  
Entity File Number 001-39655  
Entity Registrant Name GALECTO, INC.  
Entity Central Index Key 0001800315  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 37-1957007  
Entity Address, Address Line One Ole Maaloes Vej 3  
Entity Address, Address Line Two DK-2200  
Entity Address, City or Town Copenhagen N  
Entity Address, Country DK  
City Area Code +45  
Local Phone Number 70 70 52 10  
Title of 12(b) Security Common Stock, par value $0.00001 per share  
Trading Symbol GLTO  
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  
Entity Ex Transition Period false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   25,261,832