Quarterly report pursuant to Section 13 or 15(d)

Document And Entity Information

v3.19.2
Document And Entity Information - shares
6 Months Ended
Jun. 30, 2019
Aug. 06, 2019
Document Information [Line Items]    
Entity Registrant Name Aptose Biosciences Inc.  
Entity Central Index Key 0000882361  
Trading Symbol apto  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity Current Reporting Status Yes  
Entity Emerging Growth Company true  
Entity Ex Transition Period true  
Entity Small Business true  
Entity Common Stock, Shares Outstanding (in shares)   55,446,564
Entity Shell Company false  
Document Type 10-Q  
Document Period End Date Jun. 30, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Title of 12(b) Security Common Stock