CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (DEFICIT) (Parenthetical)	0 Months Ended
Sep. 05, 2013
CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (DEFICIT)
Reverse stock split	0.02

Represents the ratio applied to the conversion of reverse stock split.

No definition available.

Name:	pgrx_StockholdersEquityNoteReverseStockSplitConversionRatio
Namespace Prefix:	pgrx_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration