Note 9 - Debt - Schedule of Long Term Debt (Details) (Parentheticals) $ in Millions	6 Months Ended
Jun. 30, 2026 USD ($)
Exit payment	$ 2

Represents the amount of exit fees paid in a period.

No definition available.

Name:	pbyi_DebtInstrumentExitPayment
Namespace Prefix:	pbyi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration