CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Underwriting discounts and commissions	$ 2,415	$ 2,581
Offering expenses	$ 376	$ 351

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