v3.26.1
Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2026
Aug. 03, 2026
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2026  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Entity Registrant Name Aligos Therapeutics, Inc.  
Entity Central Index Key 0001799448  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity Shell Company false  
Entity Small Business true  
Entity Emerging Growth Company false  
Title of 12(b) Security Common Stock par value, $0.0001 per share  
Trading Symbol ALGS  
Security Exchange Name NASDAQ  
Entity File Number 001-39617  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 82-4724808  
Entity Address, Address Line One One Corporate Drive  
Entity Address, Address Line Two 2nd Floor  
Entity Address, City or Town South San Francisco  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 94080  
City Area Code 800  
Local Phone Number 466-6059  
Document Quarterly Report true  
Document Transition Report false  
Common Stock [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   6,244,558
Common Stock [Member] | Voting Common Stock [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   5,444,558
Common Stock [Member] | Non-voting Common Stock [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   800,000