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Stock-Based Compensation Plans (Incentive Plans Narrative) (Details) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Expense $ 2,200,000 $ 1,400,000 $ 4,900,000 $ 9,437,000 $ 7,548,000 $ 4,100,000
Directors' Plan
            
Plan Description      

As of December 31, 2013, the Company has four equity incentive plans: the 1994 Nonemployee Directors' Stock Option Plan (the Directors' Plan), the 1998 Stock Option Plan (the 1998 Plan), the 2005 Omnibus Incentive Plan (the 2005 Plan), and the Employee Stock Purchase Plan ("ESPP"). These plans provide that in the event of certain change in control transactions, including a merger or consolidation in which the Company is not the surviving corporation or a reorganization in which more than fifty-percent (50%) of the shares of the Company's common stock entitled to vote are exchanged, all outstanding, unvested equity awards under these plans will vest, and in the case of stock options, will become immediately exercisable.

As of December 31, 2013, there are no shares reserved for future grant under the Directors' Plan and the 1998 Plan. As of December 31, 2013, there are 4,497,990 shares reserved for future grant under the 2005 Plan. The Company's 2005 Plan provides for the grant of nonqualified stock options, incentive stock options, stock appreciation rights, restricted stock, restricted stock units, deferred stock units, performance shares, cash-based awards and other stock-based awards. Under the Company's 2005 Plan, the exercise price of stock options, the grant price of stock appreciation rights and the initial value of performance awards, must be equal to at least 100% of the fair market value of the Company's common stock on the date of grant. Stock options generally vest 28% after year one and 2% per month thereafter or 25% after year one and 6.25% every three months thereafter. Under the Company's 1998 Plan, the exercise price of options is not less than the fair market value of the Company's common stock on the date of grant. The number of shares, terms, and exercise period are determined by the board of directors on a grant-by-grant basis, and the exercise period does not extend beyond ten years from the date of the grant. Stock options generally vest 28% after one year and 2% or 3% per month thereafter or 25% after year one and 6.25% every three months thereafter.

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 are subject to the Company achieving certain performance criteria established at the grant date and the individuals fulfilling a service condition (continued employment). As of December 31, 2013, the performance criteria of 825,340 of these options had been satisfied and these options 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 $277,000, $1.1 million and $153,000 of compensation expense during the years ended December 31, 2013, 2012 and 2011, respectively, related to these options. The next performance criteria is the acceptance of the BLA filing for Natpara by the FDA. The BLA was accepted by the FDA in January 2014 and will trigger approximately $111,000 of compensation expense related to these options being recognized in the first quarter of 2014.

 

 

    
Number of Shares Reserved for Future Issuance       0    
1998 Plan
            
Plan Description      

As of December 31, 2013, the Company has four equity incentive plans: the 1994 Nonemployee Directors' Stock Option Plan (the Directors' Plan), the 1998 Stock Option Plan (the 1998 Plan), the 2005 Omnibus Incentive Plan (the 2005 Plan), and the Employee Stock Purchase Plan ("ESPP"). These plans provide that in the event of certain change in control transactions, including a merger or consolidation in which the Company is not the surviving corporation or a reorganization in which more than fifty-percent (50%) of the shares of the Company's common stock entitled to vote are exchanged, all outstanding, unvested equity awards under these plans will vest, and in the case of stock options, will become immediately exercisable.

As of December 31, 2013, there are no shares reserved for future grant under the Directors' Plan and the 1998 Plan. As of December 31, 2013, there are 4,497,990 shares reserved for future grant under the 2005 Plan. The Company's 2005 Plan provides for the grant of nonqualified stock options, incentive stock options, stock appreciation rights, restricted stock, restricted stock units, deferred stock units, performance shares, cash-based awards and other stock-based awards. Under the Company's 2005 Plan, the exercise price of stock options, the grant price of stock appreciation rights and the initial value of performance awards, must be equal to at least 100% of the fair market value of the Company's common stock on the date of grant. Stock options generally vest 28% after year one and 2% per month thereafter or 25% after year one and 6.25% every three months thereafter. Under the Company's 1998 Plan, the exercise price of options is not less than the fair market value of the Company's common stock on the date of grant. The number of shares, terms, and exercise period are determined by the board of directors on a grant-by-grant basis, and the exercise period does not extend beyond ten years from the date of the grant. Stock options generally vest 28% after one year and 2% or 3% per month thereafter or 25% after year one and 6.25% every three months thereafter.

    
Number of Shares Reserved for Future Issuance       0    
2005 Plan
            
Number of Shares Reserved for Future Issuance       3,248,782    
ESPP
            
Plan Description      

As of December 31, 2013, the Company has four equity incentive plans: the 1994 Nonemployee Directors' Stock Option Plan (the Directors' Plan), the 1998 Stock Option Plan (the 1998 Plan), the 2005 Omnibus Incentive Plan (the 2005 Plan), and the Employee Stock Purchase Plan ("ESPP"). These plans provide that in the event of certain change in control transactions, including a merger or consolidation in which the Company is not the surviving corporation or a reorganization in which more than fifty-percent (50%) of the shares of the Company's common stock entitled to vote are exchanged, all outstanding, unvested equity awards under these plans will vest, and in the case of stock options, will become immediately exercisable.

On May 19, 2010, the shareholders approved an ESPP whereby qualified employees are allowed to purchase limited amounts of the Company's common stock at the lesser of 85% of the market price at the beginning or end of the offering period. The shareholders have authorized 500,000 shares for purchase by employees. During the years ended December 31, 2013, 2012 and 2011, employees purchased 72,937, 45,553 and 37,065 shares, respectively, under the ESPP. The Company has 329,585 shares available for future purchase as of December 31, 2013.

 

    
Number of Shares Authorized       500,000    
Number of Shares Reserved for Future Issuance       329,585    
Shares of Stock Issued under plan       72,937 45,553 37,065