| Document And Entity Information | Aug. 03, 2023 |
| Document Information [Line Items] | |
| Entity, Registrant Name | PUMA BIOTECHNOLOGY, INC. |
| Document, Type | 8-K |
| Document, Period End Date | Aug. 03, 2023 |
| Entity, Incorporation, State or Country Code | DE |
| Entity, File Number | 001-35703 |
| Entity, Tax Identification Number | 77-0683487 |
| Entity, Address, Address Line One | 10880 Wilshire Boulevard, Suite 2150 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | PBYI |
| Security Exchange Name | NASDAQ |
| Entity, Emerging Growth Company | false |
| Amendment Flag | false |
| Entity, Central Index Key | 0001401667 |
