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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Mar. 14, 2025
Jun. 28, 2024
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2024    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-31    
Document Annual 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 75 State Street    
Entity Address, Address Line Two Suite 100    
Entity Address, City or Town Boston    
Entity Address, State or Province MA    
Entity Address, Postal Zip Code 02109    
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   1,322,359  
Entity Public Float     $ 12.3
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Auditor Name EY Godkendt Revisionspartnerselskab    
Auditor Location Copenhagen, Denmark    
Auditor Firm ID 1757    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

The registrant intends to file a definitive proxy statement pursuant to Regulation 14A relating to the registrant’s 2025 Annual Meeting of Stockholders within 120 days of the end of the registrant’s fiscal year ended December 31, 2024. Portions of such definitive proxy statement are incorporated by reference into Part III of this Annual Report on Form 10-K to the extent stated herein.

    
Auditor Opinion [Text Block]

Opinion on the Consolidated Financial Statements

We have audited the accompanying consolidated balance sheets of Galecto, Inc. (the Company) as of December 31, 2024 and 2023, the related consolidated statements of operations and comprehensive loss, changes in stockholders’ equity and cash flows for each of the two years in the period ended December 31, 2024, and the related notes (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company at December 31, 2024 and 2023, and the results of its operations and its cash flows for each of the two years in the period ended December 31, 2024, in conformity with U.S. generally accepted accounting principles.