| **Revenue Recognition (Details) (USD $)**    | 1 Months Ended | 6 Months Ended | 12 Months Ended |
|----------------------------------------------|----------------|----------------|-----------------|
||
| **Revenue Recognition [Abstract]**           |           |           |            |   |   |   |   |
| License revenue CytoDyn and ITM              |           |           | $ 862,000       |   |   | $ 2,827,000 |   |
| License Revenue Salix                        |           |           | 82,000          |   | 102,000 |   |   |
| Upfront license fee received CytoDyn and ITM | 200,000        | 3,500,000      |            | 3,700,000 |   |   |   |
| Upfront license fee received Salix           |           |           |            |   |   |   | 60,000,000 |
| Deferred Revenue Salix                       |           |           | $ 80,000        |   |   |   |   |

| X                                                                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Deferred Revenue Salix
+ References
No definition available.
+ Details**Name:**pgnx_DeferredRevenueSalix**Namespace Prefix:**pgnx_**Data Type:**xbrli:monetaryItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
License and Services Revenue CytoDyn and ITM
+ References
No definition available.
+ Details**Name:**pgnx_LicenseAndServicesRevenueCytodynAndItm**Namespace Prefix:**pgnx_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
License Revenue Salix
+ References
No definition available.
+ Details**Name:**pgnx_LicenseRevenueSalix**Namespace Prefix:**pgnx_**Data Type:**xbrli:monetaryItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Upfront license fee received CytoDyn and ITM
+ References
No definition available.
+ Details**Name:**pgnx_UpfrontLicenseFeeReceivedCytodynAndItm**Namespace Prefix:**pgnx_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Upfront license fee received Salix
+ References
No definition available.
+ Details**Name:**pgnx_UpfrontLicenseFeeReceivedSalix**Namespace Prefix:**pgnx_**Data Type:**xbrli:monetaryItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_RevenueRecognitionAbstract**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |