| **Summary of Significant Accounting Policies (Tables)**   | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
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| **Summary of Significant Accounting Policies [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| Schedule of estimated useful lives of fixed assets        | Expenditures for maintenance and repairs which do not materially extend the useful lives of the assets are charged to expense as incurred. The cost and accumulated depreciation of assets retired or sold are removed from the respective accounts and any gain or loss is recognized in operations. The estimated useful lives of fixed assets are as follows:Computer equipment3 yearsMachinery and equipment5-7 yearsFurniture and fixtures5 yearsLeasehold improvementsEarlier of life of improvement or lease                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| Deferred leases                                           | Our lease agreements include fixed escalations of minimum annual lease payments and we recognize rental expense on a straight-line basis over the lease terms and record the difference between rent expense and current rental payments as deferred rent. Deferred lease incentive includes a construction allowance from our landlord which is amortized as a reduction to rental expense on a straight-line basis over the lease term. As of December 31, 2012 and 2011, the Consolidated Balance Sheets include the following:  2012  2011 Other current liabilities:    Deferred lease incentive $115  $115 Total other current liabilities $115  $115 Other liabilities:        Deferred lease liability $273  $577 Deferred lease incentive  805   920 Total other liabilities $1,078  $1,497  |

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| - Definition
Tabular disclosure regarding deferred leases.
+ References
No definition available.
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| - Definition
Tabular disclosure of estimated useful lives of fixed assets.
+ References
No definition available.
+ Details**Name:**pgnx_ScheduleOfEstimatedUsefulLivesOfFixedAssetsTableTextBlock**Namespace Prefix:**pgnx_**Data Type:**nonnum:textBlockItemType**Balance Type:**na**Period Type:**duration |
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