| **Net Income (Loss) Per Share**              | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|----------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
||
| **Notes to Financial Statements [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| Net Loss Per Share                           | 3.  Net Income (Loss) Per ShareOur basic net income (loss) per share amounts have been computed by dividing net income (loss) by the weighted-average number of common shares outstanding during the period. For the nine months ended September 30, 2011, we reported net income, and the computation of diluted earnings per share is based upon the weighted-average number of our common shares and dilutive effect, determined using the treasury stock method, of potential common shares outstanding. For the three months ended September 30, 2011 and for the three and nine months ended September 30, 2010, we reported net losses and, therefore, potential common shares are not included since inclusion would have been anti-dilutive. The calculations of net income (loss) per share, basic and diluted, for these periods are as follows:   Net Income (Loss)(Numerator)  Weighted AverageCommon Shares(Denominator)  Per ShareAmount Three months ended September 30, 2011         Basic and diluted $(11,432 )  33,710  $(0.34 )Nine months ended September 30, 2011            Basic $21,127   33,501  $0.63 Dilutive effect of stock options  -   142     Dilutive effect of restricted stock  -   21     Diluted $21,127   33,664  $0.63 Three months ended September 30, 2010            Basic and diluted $(17,101 )  32,814  $(0.52 )Nine months ended September 30, 2010            Basic and diluted $(50,925 )  32,444  $(1.57 )For the three and nine months ended September 30, 2011 and 2010, anti-dilutive common shares excluded from diluted per share amounts consist of the following:   Three Months Ended September 30,    2011  2010    WeightedAverageNumber  WeightedAverageExercise Price  WeightedAverageNumber  WeightedAverageExercise Price Stock options  6,186  $12.65   5,377  $14.34 Restricted stock  9       11     Total  6,195       5,388        Nine Months Ended September 30,    2011  2010    WeightedAverageNumber  WeightedAverageExercise Price  WeightedAverageNumber  WeightedAverageExercise Price Stock options  4,126  $15.78   4,949  $15.52 Restricted stock  -       34     Total  4,126       4,983      |

| X                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**pgnx_NotesToFinancialStatementsAbstract**Namespace Prefix:**pgnx**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element may be used to capture the complete disclosure pertaining to an entity's earnings per share.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40
+ Details**Name:**us-gaap_EarningsPerShareTextBlock**Namespace Prefix:**us-gaap**Data Type:**us-types:textBlockItemType**Balance Type:**na**Period Type:**duration |