v3.26.1
Document And Entity Information
 12 Months Ended
Dec. 31, 2025
Document Information [Line Items]  
Entity Central Index Key 0000072444
Entity Registrant Name Vaxart, Inc.
Amendment Flag false
Document Type S-1
Entity Incorporation, State or Country Code DE
Entity Tax Identification Number 59-1212264
Entity Address, Address Line One 310 Utah Avenue, Suite 150
Entity Address, City or Town South San Francisco
Entity Address, State or Province CA
Entity Address, Postal Zip Code 94080
City Area Code 650
Local Phone Number 550-3500
Entity Filer Category Accelerated Filer
Entity Small Business true
Entity Emerging Growth Company false