| **Fair Value Measurements**            | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                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| **Fair Value Measurements [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              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| Fair Value Measurements                | 5.  Fair Value MeasurementsWe record the contingent consideration liability resulting from the Molecular Insight Pharmaceuticals, Inc. (MIP) acquisition at fair value in accordance with ASC 820-10-50.The following tables present our money market funds and contingent consideration liability measured at fair value on a recurring basis as of the dates indicated, classified by valuation hierarchy:    Fair Value Measurements at September 30, 2015   Balance atSeptember 30, 2015  Quoted Prices in Active Markets for Identical Assets(Level 1)  Significant Other Observable Inputs(Level 2)  Significant Unobservable Inputs(Level 3) Assets:        Money market funds $84,838  $84,838  $-  $- Total Assets $84,838  $84,838  $-  $-                  Liability:                Contingent consideration $18,100  $-  $-  $18,100           Total Liability $18,100  $-  $-  $18,100     Fair Value Measurements at December 31, 2014   Balance atDecember 31, 2014  Quoted Prices in Active Markets for Identical Assets(Level 1)  Significant Other Observable Inputs(Level 2)  Significant Unobservable Inputs(Level 3) Assets:        Money market funds $112,808  $112,808  $-  $- Total Assets $112,808  $112,808  $-  $-                  Liability:                Contingent consideration $17,200  $-  $-  $17,200          Total Liability $17,200  $-  $-  $17,200 The estimated fair value of the contingent consideration liability of $18,100 as of September 30, 2015, represents future potential milestone payments to former MIP stockholders. The Company considers this liability a Level 3 instrument (one with significant unobservable inputs) in the fair value hierarchy. The estimated fair value was determined based on probability adjusted discounted cash flow and Monte Carlo simulation models that included significant estimates and assumptions pertaining to commercialization events and sales targets. The most significant unobservable inputs were the probabilities of achieving regulatory approval of the development projects and subsequent commercial success and discount rates.Significant changes in any of the probabilities of success would result in a significantly higher or lower fair value measurement, respectively. Significant changes in the probabilities as to the periods in which milestones will be achieved would result in a significantly lower or higher fair value measurement, respectively. The Company records the contingent consideration liability at fair value with changes in estimated fair values recorded in change in contingent consideration liability in the Consolidated Statements of Operations.The following table presents quantitative information pertaining to the September 30, 2015 fair value measurement of the Level 3 inputs. The first nine months of 2015 resulted in a $900 increase in the contingent consideration liability, from $17,200 to $18,100 resulting primarily from a nine month decrease in the discount period, a 0.1% increase in the risk-free rate and a 5% increase in asset volatility which affects the probability adjusted cash flow. The following additional assumptions remained unchanged since December 31, 2014:  Fair Value as of September 30, 2015  Fair Value as of December 31, 2014 Valuation TechniqueUnobservable Input Range(Weighted Average)          Contingent considerationliability:        Azedra commercialization $2,500  $2,300 Probability adjusted discounted cash flow modelProbability of success  40%             Period of milestone expected achievement  2018              Discount rate  10%               1404 commercialization $4,100  $3,800 Probability adjusted discounted cash flow modelProbability of success  59%             Period of milestone expected achievement  2019              Discount rate  10%               MIP-1095 commercialization $500  $400 Probability adjusted discounted cash flow modelProbability of success  19%             Period of milestone expected achievement  2023              Discount rate  10%               Net sales targets $11,000  $10,700 Monte-Carlo simulationProbability of success  19% - 59%(37.4%)             Period of milestone expected achievement  2019 - 2025              Discount rates (1)  12%/3.5%(1)At September 30, 2015 and December 31, 2014, net sales targets contingent consideration liability was derived from a model under a risk neutral framework resulting in the application of 12% and 3.5% discount rates to estimated cash flows.For those financial instruments with significant Level 3 inputs, the following table summarizes the activities for the periods indicated:  Liability – Contingent ConsiderationFair Value Measurements Using SignificantUnobservable Inputs(Level 3)For the Three Months Ended September 30,   2015  2014 Description    Balance at beginning of period $18,300  $16,600 Fair value change to contingent consideration included in net (loss) income  (200)  500 Balance at end of period $18,100  $17,100   Changes in unrealized gains or losses for the period included in earnings (or changes in net assets) for liabilities held at the end of the reporting period $(200) $500   Liability – Contingent ConsiderationFair Value Measurements Using SignificantUnobservable Inputs(Level 3)For the Nine Months Ended September 30,   2015  2014 Description    Balance at beginning of period $17,200  $15,700 Fair value change to contingent consideration included in net (loss) income  900   1,400 Balance at end of period $18,100  $17,100   Changes in unrealized gains or losses for the period included in earnings (or changes in net assets) for liabilities held at the end of the reporting period $900  $1,400  |

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No definition available.
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| - Definition
The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.
+ References
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