Note 13 - Subsequent Event (Details Textual)	Oct. 01, 2019 shares
Subsequent Event [Member] \| Lantheus [Member]
Conversion of Stock, Shares Converted per Common Stock Issued and Outstanding	0.2502

Represents the shares converted per company's common stock issued and outstanding.

No definition available.

Name:	pgnx_ConversionOfStockSharesConvertedPerCommonStockIssuedAndOutstanding
Namespace Prefix:	pgnx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant