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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2024
Mar. 18, 2025
Jun. 28, 2024
Document Information [Line Items]      
Entity Central Index Key 0001626878    
Entity Registrant Name XBiotech Inc.    
Amendment Flag true    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2024    
Document Type 10-K/A    
Amendment Description This Amendment No. 1 (this “Amendment”) amends the Annual Report on Form 10-K for the year ended December 31, 2024 of XBiotech, Inc. (the “Company”), filed with the Securities and Exchange Commission (the “SEC”) on March 18, 2025 (the “Original Form 10-K”). The purpose of this Amendment is solely to amend Part III, Items 10 through 14 of the Original Form 10-K to include information previously omitted from the Original Form 10-K in reliance on General Instruction G(3) to Form 10-K which permits the above-referenced Items to be incorporated in the Annual Report on Form 10-K by reference from a definitive proxy statement, if such proxy statement is filed no later than 120 days after December 31, 2024. At this time, the Company is filing this Amendment to include Part III information in our Annual Report on Form 10-K because we do not intend to file a definitive proxy statement within 120 days of December 31, 2024. Accordingly, Part III of the Original Form 10-K is hereby amended and restated as set forth herein. The information included herein as required by Part III, Items 10 through 14 of Form 10-K is more limited than what is required to be included in the definitive proxy statement to be filed in connection with our annual meeting of stockholders. Accordingly, the definitive proxy statement to be filed at a later date will include additional information related to the topics herein and additional information not required by Part III, Items 10 through 14 of Form 10-K.    The reference on the cover page of the Original Form 10-K to the incorporation by reference of our definitive proxy statement into Part III of the Original Form 10-K is hereby deleted.   Except as stated herein, this Amendment does not reflect events occurring after the filing of the Original Form 10-K and no attempt has been made in this Amendment to modify or update other disclosures as presented in the Original Form 10-K.    
Document Annual Report true    
Document Period End Date Dec. 31, 2024    
Document Transition Report false    
Entity File Number 001-37437    
Entity Incorporation, State or Country Code A1    
Entity Address, Address Line One 5217 Winnebago Ln    
Entity Address, City or Town Austin    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 78744    
City Area Code 512    
Local Phone Number 386-2900    
Title of 12(b) Security Common Stock, par value $0.0001 per share    
Trading Symbol XBIT    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 121,869,724
Entity Common Stock, Shares Outstanding   30,487,731