v3.26.1
Document And Entity Information - shares
 6 Months Ended
Jun. 30, 2026
Aug. 03, 2026
Document Information [Line Items]    
Entity Central Index Key 0001401667  
Entity Registrant Name PUMA BIOTECHNOLOGY, INC.  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2026  
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2026  
Document Transition Report false  
Entity File Number 001-35703  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 77-0683487  
Entity Address, Address Line One 10880 Wilshire Boulevard, Suite 1700  
Entity Address, City or Town Los Angeles  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 90024  
City Area Code 424  
Local Phone Number 248-6500  
Title of 12(b) Security Common Stock, par value $0.0001 per share  
Trading Symbol PBYI  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   51,620,066