CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) (Parenthetical) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2014	Jun. 30, 2013
Underwriting discounts and commissions	$ 2,415	$ 2,244
Offering expenses	$ 376	$ 314

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