Annual report pursuant to Section 13 and 15(d)

Document And Entity Information

Document And Entity Information - USD ($)
12 Months Ended
Dec. 31, 2023
Apr. 29, 2024
Jun. 30, 2023
Cover [Abstract]      
Entity Central Index Key 0000882361    
Entity Registrant Name Aptose Biosciences Inc.    
Amendment Flag true    
Amendment Description EXPLANATORY NOTE TO AMENDMENT NO. 1 Aptose Biosciences Inc., ("Aptose", the "Company," "we," or "our"), is filing this Amendment No. 1 on Form 10-K/A, or this Amendment No. 1, to its Annual Report on Form 10-K for the fiscal year ended December 31, 2023, which was filed with the Securities and Exchange Commission on March 26, 2024, (the "Original Form 10-K"), for the sole purpose of including the information required by Part III of Form 10-K. This information was previously omitted from the Original Form 10-K in reliance on General Instruction G(3) to Form 10-K, which permits the information required by Part III to be incorporated by reference from our definitive proxy statement if such statement is filed no later than 120 days after our fiscal year-end. We are filing this Amendment No. 1 to include Part III information in our Annual Report on Form 10-K because we will not file a definitive proxy statement containing this information within 120 days after the end of the fiscal year covered by the Original Form 10-K. Pursuant to Rule 12b-15 under the Securities Exchange Act of 1934, as amended, or the Exchange Act, this Amendment No. 1 also contains certifications pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, which are attached hereto. Because no financial statements have been included in this Amendment No. 1 and this Amendment No. 1 does not contain or amend any disclosure with respect to Items 307 and 308 of Regulation S-K, paragraphs 3, 4, and 5 of the certifications have been omitted. Except as explicitly set forth herein, this Amendment No. 1 does not purport to modify or update the disclosures in, or exhibits to, theOriginal Form 10-K or to update the Original Form 10-K to reflect events occurring after the date of such filing.    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2023    
Document Type 10-K/A    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Document Transition Report false    
Securities Act File Number 001-32001    
Entity Incorporation, State or Country Code Z4    
Entity Tax Identification Number 98-1136802    
Entity Address, Address Line One 251 Consumers Road, Suite 1105    
Entity Address, City or Town Toronto    
Entity Address, State or Province ON    
Entity Address, Postal Zip Code M2J 4R3    
City Area Code 647    
Local Phone Number 479-9828    
Title of 12(b) Security Common Shares, no par value    
Trading Symbol APTO    
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     $ 29,584,561
Entity Common Stock, Shares Outstanding   16,252,114  
Documents Incorporated by Reference [Text Block]


Auditor Name KPMG LLP    
Auditor Location Vaughn, Canada    
Auditor Firm ID 85