Stock Options (Performance Conditions Options Narrative) (Details) (USD $)	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Share-based Compensation Expense	$ 2,100,000	$ 1,600,000	$ 5,100,000	$ 3,500,000
Performance Condition Options
Description of award			During the year ended December 31, 2010, the Company's Board of Directors awarded a total of 1,130,700 performance condition options to certain of the Company's employees. Vesting of these options is subject to the Company achieving certain performance criteria established at the grant date and the individuals fulfilling a service condition (continued employment). As of June 30, 2013, the performance criteria of 825,340 of these options had been satisfied and will become exercisable based on the following vesting schedule: 25% on each of the first four anniversaries of the date of grant, which was February 20, 2010 (the date of grant). The Company recognized $83,000 and $244,000 of compensation expense during the three and six months ended June 30, 2013, respectively and $32,000 and $316,000 of compensation expense during the three and six months ended June 30, 2012, respectively, related to these options. The next performance criteria is the acceptance of the BLA filing for Natpara by the FDA. This acceptance would trigger approximately $98,000 of compensation expense related to these options. The Company utilized the Black-Scholes option pricing model to determine the grant date fair value of these awards. As of June 30, 2013, except for the 825,340 options discussed above, the Company does not believe that the achievement of the remaining performance criteria is probable and therefore, has not recognized any compensation expense related to these options during the three and six months ended June 30, 2013 and 2012, respectively. Compensation expense will be recognized only once the performance condition is probable of being achieved and then only the cumulative amount related to the service condition that has been fulfilled. On May 7, 2013, the Company held its Annual Meeting of Stockholders. At the Annual Meeting, the Company's stockholders approved an amendment to the Company's 2005 Omnibus Incentive Plan to, among other things, increase by 3,500,000 the shares reserved for issuance under the Plan.
Share-based Compensation Expense	$ 83,000	$ 32,000	$ 244,000	$ 316,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	1,130,700		1,130,700
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized				3,500,000

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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- Definition

General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy.

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- Definition

Number of additional shares authorized for issuance under an established share-based compensation plan.

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No definition available.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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