CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Underwriting discounts and commissions	$ 2,415	$ 2,581	$ 1,518
Offering expenses	$ 376pgnx_CommonStockOfferingExpenses	$ 351pgnx_CommonStockOfferingExpenses	$ 434pgnx_CommonStockOfferingExpenses

Underwriting discounts and commissions associated with a common stock offering during the reporting period.

No definition available.

Name:	pgnx_CommonStockUnderwritingDiscountsAndCommissions
Namespace Prefix:	pgnx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration