| **Fair Value Measurements (Details) (USD $)In Thousands, unless otherwise specified**                    | 12 Months Ended                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                               |                                                                               |
|----------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------|
||
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**         |                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                          |                                                                          |
| Contingent consideration liability                                                                       | $ 15,700us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent                                                                                                                                                                                 | $ 17,200us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent                                                                                                                                                                                 | $ 15,900us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent |
| Auction rate securities                                                                                  | 2,208us-gaap_AuctionRateSecuritiesNoncurrent                                                                                                                                                                                                                  | 0us-gaap_AuctionRateSecuritiesNoncurrent                                                                                                                                                                                                                      |                                                                          |
| Amount of temporary impairment                                                                           | 192us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss                                                                                                                                                                                                      |                                                                                                                                                                                                                                                          |                                                                          |
| **Summarize the amortized cost basis, the aggregate fair value and gross unrealized holding [Abstract]** |                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                          |                                                                          |
| Amortized Cost Basis                                                                                     | 2,400us-gaap_AvailableForSaleSecuritiesAmortizedCost                                                                                                                                                                                                          |                                                                                                                                                                                                                                                          |                                                                          |
| Fair Value                                                                                               | 2,208us-gaap_AvailableForSaleSecurities                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                          |                                                                          |
| Gross Unrealized Holding, Gains                                                                          | 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains                                                                                                                                                                                                       |                                                                                                                                                                                                                                                          |                                                                          |
| Gross Unrealized Holding, Losses                                                                         | (192)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss                                                                                                                                                                                                    |                                                                                                                                                                                                                                                          |                                                                          |
| Gross Unrealized Holding Gains (Losses), Net                                                             | (192)us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1                                                                                                                                                                                               |                                                                                                                                                                                                                                                          |                                                                          |
| **Continuous unrealized loss position, Unrealized Losses [Abstract]**                                    |                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                          |                                                                          |
| Number of securities with gross unrealized loss position                                                 | 1us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1                                                                                                                                                           |                                                                                                                                                                                                                                                          |                                                                          |
| Weighted average duration of unrealized losses                                                           | 70 months                                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                                          |                                                                          |
| Contingent consideration liability                                                                       | 15,700us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent                                                                                                                                                                                   | 17,200us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent                                                                                                                                                                                   | 15,900us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent   |
| Maximum [Member]                                                                                         |                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                          |                                                                          |
| **Continuous unrealized loss position, Unrealized Losses [Abstract]**                                    |                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                          |                                                                          |
| Severity of the unrealized losses below amortized cost (in hundredths)                                   | 8.00%pgnx_AvailableForSaleSecuritiesSeverityOfUnrealizedLossPercentage/ us-gaap_RangeAxis= us-gaap_MaximumMember                                                                                                                                              |                                                                                                                                                                                                                                                          |                                                                          |
| Maturities Greater Than Ten Years [Member]                                                               |                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                          |                                                                          |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**         |                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                          |                                                                          |
| Amount of temporary impairment                                                                           | 192us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= pgnx_MaturitiesGreaterThanTenYearsMember                                                                                                           |                                                                                                                                                                                                                                                          |                                                                          |
| **Summarize the amortized cost basis, the aggregate fair value and gross unrealized holding [Abstract]** |                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                          |                                                                          |
| Amortized Cost Basis                                                                                     | 2,400us-gaap_AvailableForSaleSecuritiesAmortizedCost/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= pgnx_MaturitiesGreaterThanTenYearsMember                                                                                                               |                                                                                                                                                                                                                                                          |                                                                          |
| Fair Value                                                                                               | 2,208us-gaap_AvailableForSaleSecurities/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= pgnx_MaturitiesGreaterThanTenYearsMember                                                                                                                            |                                                                                                                                                                                                                                                          |                                                                          |
| Gross Unrealized Holding, Gains                                                                          | 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= pgnx_MaturitiesGreaterThanTenYearsMember                                                                                                            |                                                                                                                                                                                                                                                          |                                                                          |
| Gross Unrealized Holding, Losses                                                                         | (192)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= pgnx_MaturitiesGreaterThanTenYearsMember                                                                                                         |                                                                                                                                                                                                                                                          |                                                                          |
| Gross Unrealized Holding Gains (Losses), Net                                                             | (192)us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= pgnx_MaturitiesGreaterThanTenYearsMember                                                                                                    |                                                                                                                                                                                                                                                          |                                                                          |
| U.S. Government Subsidized Securities [Member] | Minimum [Member]                                        |                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                          |                                                                          |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**         |                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                          |                                                                          |
| Maturity period of US government subsidized securities (in years)                                        | 10 years                                                                                                                                                                                                                                                      |                                                                                                                                                                                                                                                          |                                                                          |
| U.S. Government Subsidized Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]      |                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                          |                                                                          |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**         |                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                          |                                                                          |
| Auction rate securities                                                                                  | 2,208us-gaap_AuctionRateSecuritiesNoncurrent/ pgnx_FairValueByAssetSecondaryClassificationAxis= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member             |                                                                                                                                                                                                                                                          |                                                                          |
| Auction Rate Securities [Member]                                                                         |                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                          |                                                                          |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**         |                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                          |                                                                          |
| Auction rate securities                                                                                  | 2,208us-gaap_AuctionRateSecuritiesNoncurrent/ us-gaap_FairValueByAssetClassAxis= us-gaap_AuctionRateSecuritiesMember                                                                                                                                          |                                                                                                                                                                                                                                                          |                                                                          |
| **Continuous unrealized loss position, Fair Value [Abstract]**                                           |                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                          |                                                                          |
| Less than 12 Months, Fair Value                                                                          | 0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue/ us-gaap_FairValueByAssetClassAxis= us-gaap_AuctionRateSecuritiesMember                                                                                      |                                                                                                                                                                                                                                                          |                                                                          |
| 12 Months or Greater, Fair Value                                                                         | 2,208us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue/ us-gaap_FairValueByAssetClassAxis= us-gaap_AuctionRateSecuritiesMember                                                                                  |                                                                                                                                                                                                                                                          |                                                                          |
| Total, Fair Value                                                                                        | 2,208us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue/ us-gaap_FairValueByAssetClassAxis= us-gaap_AuctionRateSecuritiesMember                                                                                                      |                                                                                                                                                                                                                                                          |                                                                          |
| **Continuous unrealized loss position, Unrealized Losses [Abstract]**                                    |                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                          |                                                                          |
| Less than 12 Months, Unrealized Losses                                                                   | 0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses/ us-gaap_FairValueByAssetClassAxis= us-gaap_AuctionRateSecuritiesMember                                                                                    |                                                                                                                                                                                                                                                          |                                                                          |
| 12 Months or Greater, Unrealized Losses                                                                  | (192)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses/ us-gaap_FairValueByAssetClassAxis= us-gaap_AuctionRateSecuritiesMember                                                                                |                                                                                                                                                                                                                                                          |                                                                          |
| Total, Unrealized Losses                                                                                 | (192)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses/ us-gaap_FairValueByAssetClassAxis= us-gaap_AuctionRateSecuritiesMember                                                                                                |                                                                                                                                                                                                                                                          |                                                                          |
| Recurring [Member]                                                                                       |                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                          |                                                                          |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**         |                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                          |                                                                          |
| Contingent consideration liability                                                                       | 15,700us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember                                                                                        | 17,200us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember                                                                                        |                                                                          |
| Money market funds                                                                                       | 60,364us-gaap_CashAndCashEquivalentsFairValueDisclosure/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember                                                                                                            | 112,808us-gaap_CashAndCashEquivalentsFairValueDisclosure/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember                                                                                                           |                                                                          |
| Auction rate securities                                                                                  | 2,208us-gaap_AuctionRateSecuritiesNoncurrent/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember                                                                                                                       |                                                                                                                                                                                                                                                          |                                                                          |
| Liability, total                                                                                         | 15,700us-gaap_LiabilitiesFairValueDisclosureRecurring/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember                                                                                                              | 17,200us-gaap_LiabilitiesFairValueDisclosureRecurring/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember                                                                                                              |                                                                          |
| Asset, total                                                                                             | 62,572us-gaap_InvestmentsFairValueDisclosure/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember                                                                                                                       | 112,808us-gaap_InvestmentsFairValueDisclosure/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember                                                                                                                      |                                                                          |
| **Continuous unrealized loss position, Unrealized Losses [Abstract]**                                    |                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                          |                                                                          |
| Contingent consideration liability                                                                       | 15,700us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember                                                                                        | 17,200us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember                                                                                        |                                                                          |
| Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]             |                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                          |                                                                          |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**         |                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                          |                                                                          |
| Contingent consideration liability                                                                       | 0us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember        | 0us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember        |                                                                          |
| Money market funds                                                                                       | 60,364us-gaap_CashAndCashEquivalentsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember                       | 112,808us-gaap_CashAndCashEquivalentsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember                      |                                                                          |
| Auction rate securities                                                                                  | 0us-gaap_AuctionRateSecuritiesNoncurrent/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember                                      |                                                                                                                                                                                                                                                          |                                                                          |
| Liability, total                                                                                         | 0us-gaap_LiabilitiesFairValueDisclosureRecurring/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember                              | 0us-gaap_LiabilitiesFairValueDisclosureRecurring/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember                              |                                                                          |
| Asset, total                                                                                             | 60,364us-gaap_InvestmentsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember                                  | 112,808us-gaap_InvestmentsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember                                 |                                                                          |
| **Continuous unrealized loss position, Unrealized Losses [Abstract]**                                    |                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                          |                                                                          |
| Contingent consideration liability                                                                       | 0us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember        | 0us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember        |                                                                          |
| Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]                              |                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                          |                                                                          |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**         |                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                          |                                                                          |
| Contingent consideration liability                                                                       | 0us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember        | 0us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember        |                                                                          |
| Money market funds                                                                                       | 0us-gaap_CashAndCashEquivalentsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember                            | 0us-gaap_CashAndCashEquivalentsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember                            |                                                                          |
| Auction rate securities                                                                                  | 0us-gaap_AuctionRateSecuritiesNoncurrent/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember                                      |                                                                                                                                                                                                                                                          |                                                                          |
| Liability, total                                                                                         | 0us-gaap_LiabilitiesFairValueDisclosureRecurring/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember                              | 0us-gaap_LiabilitiesFairValueDisclosureRecurring/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember                              |                                                                          |
| Asset, total                                                                                             | 0us-gaap_InvestmentsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember                                       | 0us-gaap_InvestmentsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember                                       |                                                                          |
| **Continuous unrealized loss position, Unrealized Losses [Abstract]**                                    |                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                          |                                                                          |
| Contingent consideration liability                                                                       | 0us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember        | 0us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember        |                                                                          |
| Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]                                  |                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                          |                                                                          |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**         |                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                          |                                                                          |
| Contingent consideration liability                                                                       | 15,700us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember   | 17,200us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember   |                                                                          |
| Money market funds                                                                                       | 0us-gaap_CashAndCashEquivalentsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember                            | 0us-gaap_CashAndCashEquivalentsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember                            |                                                                          |
| Auction rate securities                                                                                  | 2,208us-gaap_AuctionRateSecuritiesNoncurrent/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember                                  |                                                                                                                                                                                                                                                          |                                                                          |
| Liability, total                                                                                         | 15,700us-gaap_LiabilitiesFairValueDisclosureRecurring/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember                         | 17,200us-gaap_LiabilitiesFairValueDisclosureRecurring/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember                         |                                                                          |
| Asset, total                                                                                             | 2,208us-gaap_InvestmentsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember                                   | 0us-gaap_InvestmentsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember                                       |                                                                          |
| **Continuous unrealized loss position, Unrealized Losses [Abstract]**                                    |                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                          |                                                                          |
| Contingent consideration liability                                                                       | $ 15,700us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember | $ 17,200us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ us-gaap_FairValueByMeasurementFrequencyAxis= us-gaap_FairValueMeasurementsRecurringMember |                                                                          |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This item represents the gross percentage of severity of unrealized losses for securities, below amortized costs at a point in time, which are categorized neither as held-to-maturity nor trading securities.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents maturity period of securities held by the entity as on date of reporting.
+ References
No definition available.
+ Details**Name:**pgnx_MaturityPeriodOfSecurities**Namespace Prefix:**pgnx_**Data Type:**xbrli:durationItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                            |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Refers to period of weighted average duration of the unrealized losses.
+ References
No definition available.
+ Details**Name:**pgnx_WeightedAverageDurationOfUnrealizedLosses**Namespace Prefix:**pgnx_**Data Type:**xbrli:durationItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of securities that are debt instruments (corporate or municipal bonds) that typically have long-term nominal maturities for which the interest rate is reset through an auction process.
+ References
No definition available.
+ Details**Name:**us-gaap_AuctionRateSecuritiesNoncurrent**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.
+ References
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Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer.
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Amount of unrealized loss on securities classified as available-for-sale.
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This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.
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Amount of unrealized loss on investments in available-for-sale securities that have been in a loss position for less than twelve months.
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This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer.
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Amount of unrealized gain (loss) on investments in debt and equity securities classified as available-for-sale securities.
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Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.
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Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.
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Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.
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Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled beyond one year or the normal operating cycle, if longer.
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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.
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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.
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Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity.
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