| **CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $)In Thousands, unless otherwise specified**                       | Mar. 31, 2015                                                                                | Dec. 31, 2014                                                                                |
|-------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------|
| **Current assets:**                                                                                               |                                                                                         |                                                                                         |
| Cash and cash equivalents                                                                                         | $ 108,430us-gaap_CashAndCashEquivalentsAtCarryingValue                                       | $ 119,302us-gaap_CashAndCashEquivalentsAtCarryingValue                                       |
| Accounts receivable, net                                                                                          | 152us-gaap_AccountsReceivableNetCurrent                                                      | 109us-gaap_AccountsReceivableNetCurrent                                                      |
| Other current assets                                                                                              | 3,006us-gaap_OtherAssetsCurrent                                                              | 2,515us-gaap_OtherAssetsCurrent                                                              |
| Total current assets                                                                                              | 111,588us-gaap_AssetsCurrent                                                                 | 121,926us-gaap_AssetsCurrent                                                                 |
| Fixed assets, at cost, net of accumulated depreciation and amortization                                           | 2,473us-gaap_PropertyPlantAndEquipmentNet                                                    | 2,552us-gaap_PropertyPlantAndEquipmentNet                                                    |
| Intangible assets, net (Note 5)                                                                                   | 28,700pgnx_BusinessEntityAcquisitionPurchasePriceAllocationIntangibleAssetsOtherThanGoodwill | 28,700pgnx_BusinessEntityAcquisitionPurchasePriceAllocationIntangibleAssetsOtherThanGoodwill |
| Goodwill                                                                                                          | 7,702pgnx_BusinessEntityAcquisitionPurchasePriceAllocationGoodwillAmount                     | 7,702pgnx_BusinessEntityAcquisitionPurchasePriceAllocationGoodwillAmount                     |
| Other assets                                                                                                      | 157us-gaap_OtherAssetsNoncurrent                                                             | 157us-gaap_OtherAssetsNoncurrent                                                             |
| Total assets                                                                                                      | 150,620us-gaap_Assets                                                                        | 161,037us-gaap_Assets                                                                        |
| **Current liabilities:**                                                                                          |                                                                                         |                                                                                         |
| Accounts payable and accrued expenses                                                                             | 5,301us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent                                     | 6,570us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent                                     |
| Other current liabilities                                                                                         | 115us-gaap_OtherLiabilitiesCurrent                                                           | 115us-gaap_OtherLiabilitiesCurrent                                                           |
| Total current liabilities                                                                                         | 5,416us-gaap_LiabilitiesCurrent                                                              | 6,685us-gaap_LiabilitiesCurrent                                                              |
| Contingent consideration liability                                                                                | 17,500us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent                  | 17,200us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent                  |
| Deferred tax liability - long term                                                                                | 11,332us-gaap_DeferredTaxLiabilities                                                         | 11,332us-gaap_DeferredTaxLiabilities                                                         |
| Other liabilities                                                                                                 | 899us-gaap_OtherLiabilitiesNoncurrent                                                        | 911us-gaap_OtherLiabilitiesNoncurrent                                                        |
| Total liabilities                                                                                                 | 35,147us-gaap_Liabilities                                                                    | 36,128us-gaap_Liabilities                                                                    |
| Commitments and contingencies (Note 10)                                                                           |                                                                                    |                                                                                    |
| **Stockholders' equity:**                                                                                         |                                                                                         |                                                                                         |
| Preferred stock, $.001 par value; 20,000,000 shares authorized; issued and outstanding - none                     | 0us-gaap_PreferredStockValue                                                                 | 0us-gaap_PreferredStockValue                                                                 |
| Common stock, $.0013 par value; 160,000,000 shares authorized; issued - 69,844,949 in 2015 and 69,832,949 in 2014 | 91us-gaap_CommonStockValue                                                                   | 91us-gaap_CommonStockValue                                                                   |
| Additional paid-in capital                                                                                        | 590,644us-gaap_AdditionalPaidInCapitalCommonStock                                            | 589,826us-gaap_AdditionalPaidInCapitalCommonStock                                            |
| Accumulated deficit                                                                                               | (472,521)us-gaap_RetainedEarningsAccumulatedDeficit                                          | (462,267)us-gaap_RetainedEarningsAccumulatedDeficit                                          |
| Treasury stock, at cost (200,000 shares in 2015 and 2014)                                                         | (2,741)us-gaap_TreasuryStockValue                                                            | (2,741)us-gaap_TreasuryStockValue                                                            |
| Total stockholders' equity                                                                                        | 115,473us-gaap_StockholdersEquity                                                            | 124,909us-gaap_StockholdersEquity                                                            |
| Total liabilities and stockholders' equity                                                                        | $ 150,620us-gaap_LiabilitiesAndStockholdersEquity                                            | $ 161,037us-gaap_LiabilitiesAndStockholdersEquity                                            |

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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.
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| - Definition
Amount of acquisition cost of a business combination allocated to assets, excluding financial assets and goodwill, lacking physical substance.
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Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.
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| - Definition
Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.
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| - Definition
Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital.
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| - Definition
Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.
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| - Definition
Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.
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| - Definition
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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| - Definition
Amount 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. Excludes cash and cash equivalents within disposal group and discontinued operation.
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| - Definition
Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur.
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| - Definition
Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.
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| - Definition
Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances.
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| - Definition
Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.
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| - Definition
Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.
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| - Definition
Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.
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| - Definition
Aggregate carrying amount, as of the balance sheet date, of current assets not separately disclosed in the balance sheet. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer).
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Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).
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| - Definition
Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered and of liabilities not separately disclosed.
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Aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet. Noncurrent liabilities are expected to be paid after one year (or the normal operating cycle, if longer).
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| - Definition
Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.
+ References
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| - Definition
Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.
+ References
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| - Definition
The cumulative amount of the reporting entity's undistributed earnings or deficit.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.
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| - Definition
The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.
+ References
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