| **In-Process Research and Development and Goodwill (Details) (USD $)In Thousands, unless otherwise specified** | 3 Months Ended                                                  |                                                                 |                                                                |
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| **Goodwill and indefinite lived in-process research and development [Abstract]**                               |                                                            |                                                            |                                                           |   |
| Goodwill                                                                                                       | $ 7,702us-gaap_Goodwill                                         | $ 7,702us-gaap_Goodwill                                         | $ 7,702us-gaap_Goodwill                                        | $ 7,702us-gaap_Goodwill |
| Goodwill, Acquired During Period                                                                               | 0us-gaap_GoodwillAcquiredDuringPeriod                           | 0us-gaap_GoodwillAcquiredDuringPeriod                           |                                                           |   |
| Indefinite-Lived Intangible Assets (Excluding Goodwill)                                                        | 28,700us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill  | 31,360us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill  | 28,700us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill | 31,360us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill |
| Impairment of Indefinite Intangible Assets (Excluding Goodwill)                                                | $ 0pgnx_ImpairmentOfIndefiniteIntangibleAssetsExcludingGoodwill | $ 0pgnx_ImpairmentOfIndefiniteIntangibleAssetsExcludingGoodwill |                                                           |   |

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| X                                                                                                                                                                                                                                                                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an indefinite intangible asset (excluding goodwill) to fair value.
+ References
No definition available.
+ Details**Name:**pgnx_ImpairmentOfIndefiniteIntangibleAssetsExcludingGoodwill**Namespace Prefix:**pgnx_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275
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