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Long-term Debt - Note 9
12 Months Ended
Dec. 31, 2013
Long-Term Debt Disclosure  
Long-Term Debt

(9) Long-term Debt

The following table reflects the carrying value of our long-term debt under various financing arrangements as of December 31, 2013 and 2012 (in thousands):

      December 31,
      2013     2012
Convertible notes   $ 16,545    $ 16,545 
Non-recourse debt     132,387      159,302 
     Total debt     148,932      175,847 
Less current portion     25,297      6,278 
     Total long-term debt   $ 123,635    $ 169,569 

(a) Convertible Notes

In August 2007, the Company completed a private placement of $50.0 million in 5.75% Convertible Notes due August 7, 2014 (5.75% Convertible Notes). The Company received net proceeds from the 5.75% Convertible Notes of approximately $49.4 million, after deducting costs associated with the offering. The 5.75% Convertible Notes accrue interest at an annual rate of 5.75% payable quarterly in arrears on the first day of the succeeding calendar quarter commencing January 1, 2008. As of December 31, 2013, the Company classified the 5.75% Convertible Notes as current debt. Accrued interest on the 5.75% Convertible Notes was $0 as of December 31, 2013 and 2012, respectively. The holders may convert all or a portion of the 5.75% Convertible Notes into common stock at any time, subject to certain limitations, on or before August 7, 2014. The 5.75% Convertible Notes are convertible into common stock at a conversion price of $5.44 per share (see below), subject to adjustments in certain events. The 5.75% Convertible Notes are unsecured debt obligations and rank equally in right of payment with all existing and future unsecured senior indebtedness. The 5.75% Convertible Notes provide for certain events of default, including payment defaults, breaches of covenants and certain events of bankruptcy, insolvency and reorganization. The 5.75% Convertible Notes also provide that if there shall occur a fundamental change, as defined, at any time prior to the maturity of the Note, then the holder shall have the right, at the Holder's option, to require the Company to redeem the notes, or any portion thereof plus accrued interest and liquidated damages, if any. If a change of control, as defined, occurs and if the holder converts notes in connection with any such transaction, the Company will pay a make whole premium by increasing the conversion rate applicable to the notes. If any event of default occurs and is continuing, the principal amount of the 5.75% Convertible Notes, plus accrued and unpaid interest, if any, may be declared immediately due and payable. The Company incurred debt issuance costs of approximately $600,000, which have been deferred and which are being amortized over a seven-year period. The effective interest rate on the 5.75% Convertible Notes, including debt issuance costs, is 5.9%.

On January 31, 2011 and April 14, 2011, certain holders of the 5.75% Convertible Notes converted portions of the outstanding notes at a conversion price of $5.44 per share. The Company issued 529,282 and 5,620,445 shares on January 31, 2011 and April 14, 2011, respectively, pursuant to this conversion and retired $2.9 million and $30.6 million, respectively, of the outstanding 5.75% Convertible Notes. The Company has $16.5 million of the 5.75% Convertible Notes outstanding as of December 31, 2013.

Pursuant to the Registration Rights Agreement, the Company has filed a shelf registration statement with the SEC, covering resales of the common stock issuable upon conversion of the 5.75% Convertible Notes. The registration statement has been declared effective. The Company agreed to use its reasonable best efforts to keep the registration statement effective until the earlier of (i) the date as of which holders may sell all of the securities covered by the registration statement without restriction pursuant to Rule 144(k) promulgated under the Securities Act of 1933 or (ii) the date on which holders shall have sold all of the securities covered by the registration statement. If the Company fails to comply with these covenants or suspends use of the registration statement for periods of time that exceed what is permitted under the Registration Rights Agreement, the Company is required to pay liquidated damages in an amount equivalent to 1% per annum of (a) the principal amount of the notes outstanding, or (b) the conversion price of each underlying share of common stock that has been issued upon conversion of a note, in each case, until the Company is in compliance with these covenants. The Company believes the likelihood of such an event occurring is remote and, as such, the Company has not recorded a liability as of December 31, 2013.

(b) Non-recourse Debt

Sensipar and Mimpara-secured Non-recourse Debt

As of December 31, 2013 and 2012, the outstanding principal balances on Sensipar and Mimpara-secured debt were $54.4 million and $80.2 million, respectively. The Sensipar and Mimpara-secured debt is non-recourse to the Company and solely secured and serviced by its Sensipar and Mimpara (cinacalcet HCl) royalty revenues and milestone payments. The Sensipar and Mimpara-secured non-recourse debt relates to the following royalty monetization transactions: (i) the private placement of $175.0 million in non-recourse 8.0% Notes due March 30, 2017 (Class A Notes), (ii) the private placement of $100.0 million in non-recourse 15.5% Notes due March 30, 2017 (Class B Notes), and (iii) the amendment of the Company's agreement with Amgen in August 2011.

The Class A Notes were paid in full on March 30, 2011 and the Class B Notes were paid in full on September 30, 2011 when they were redeemable at their par value.

The Company amended its agreement with Amgen effective September 30, 2011 whereby Amgen advanced $145.0 million of Sensipar and Mimpara royalties to the Company. The Sensipar Notes accrue interest at an annual rate of 9%, compounded quarterly and payable forty-five days after the close of each quarter. The payment of the royalty advance and discount shall be satisfied solely by Amgen's withholding of royalties and except in the event of a breach of certain customary representations and warranties under the agreement, the Company will have no obligation to repay any unsettled amount. The Company further amended the agreement with Amgen effective June 29, 2012, limiting the royalty offset of the royalty advance up to $8.0 million per quarter with royalties in excess of $8.0 million paid to the Company for the respective quarter, thereby extending the royalty advance repayment period. After the payment of the royalty advance and a 9 percent per annum discount on the balance of the advance, Amgen will resume paying NPS all royalties earned through December 31, 2018. As of December 31, 2013, the Company classified $6.8 million of the Sensipar Notes as current based on royalty payments accrued as of December 31, 2013. The Sensipar Notes are non-recourse to the Company. The outstanding principal balance on the Sensipar Notes, was $54.4 million and $80.2 million as of December 31, 2013 and 2012, respectively. Accrued interest on the Sensipar Notes was approximately $592,000 and $874,000 as of December 31, 2013 and 2012, respectively. The Company incurred debt issuance costs of $96,000, which are being amortized using the effective interest method. The effective interest rate on the Sensipar Notes, including debt issuance costs, is approximately 9%.

Under the Company's agreement for the Sensipar Notes, the Company would potentially be liable for its breaches or defaults, if any.

PTH 1-84-secured Non-recourse Debt

As of December 31, 2013 and 2012, the outstanding principal balances on the PTH 1-84-secured debt were $42.8 million, respectively. In July 2007, the Company entered into an agreement with DRI Capital, or DRI, formerly Drug Royalty L.P.3, in which the Company sold to DRI its right to receive future royalty payments arising from sales of recombinant human parathyroid hormone 1-84 [rDNA origin] ("PTH") under its license agreement with Takeda. Under the agreement, DRI paid the Company an up-front purchase price of $50.0 million. If and when DRI receives two and a half times the amount paid to the Company, the agreement will terminate and the remainder of the royalties, if any, will revert back to the Company. In connection with the Company's July 2007 agreement with DRI, the Company granted DRI a security interest in its license agreement with Takeda for Preotact and certain of its patents and other intellectual property underlying that agreement. In the event of a default by NPS under the agreement with DRI, DRI would be entitled to enforce its security interest against NPS and the property described above.

In December 2013, the Company entered into an amendment and restatement (the "Amendment and Restatement") to its agreement with DRI. Pursuant to the Termination and Transition Agreement between NPS and Takeda (See note 10), NPS' license agreement with Takeda was terminated and NPS re-acquired exclusive rights worldwide, excluding Israel, to develop and commercialize PTH. Preotact is the brand name that Takeda had used to market PTH for the treatment of osteoporosis in certain of its licensed territories. NPS is developing PTH in the U.S. under the trade name Natpara for the treatment of hypoparathyroidism. NPS filed a BLA for Natpara with the FDA in October 2013.

Pursuant to the Amendment and Restatement, (i) DRI has consented to the commercialization of PTH by the Company, (ii) the terms of the 2007 Agreement are tolled, and (iii) the parties' rights and obligations regarding PTH and related technology are governed by the Amendment and Restatement.

The Company will be required to pay royalties in the mid-single digits to DRI based upon sales of PTH by the Company and its licensees (if any) worldwide, excluding Israel. The Company has agreed to undertake certain efforts to commercialize PTH. If the Company does not submit a Marketing Authorization Application to the European Medicines Agency for PTH in the European Union by an agreed upon date, DRI will have the right to revoke the consent granted in the Amendment and Restatement, reinstate the 2007 Agreement, and either cause the Company to enter into a new license agreement with a third party with respect to PTH on terms that are substantially similar and no more extensive (when taken as a whole) than the terms contained in the terminated Takeda License Agreement, or negotiate such an agreement on NPS' behalf.

The Company's obligation to pay royalties to DRI under the Amendment and Restatement shall expire on a country-by-country basis upon the later of (i) the last to expire patent controlled by the Company with claims covering PTH in such country or (ii) the expiration of any period of regulatory exclusivity applicable to PTH in such country. The Company's obligation to pay royalties to DRI under the Amendment and Restatement shall terminate in its entirety once cumulative royalty payments made to DRI by Takeda and the Company total $125.0 million. As of December 31, 2013, $45.5 million in royalties had been paid to DRI.

DRI continues to maintain a security interest in NPS patents that contain claims covering PTH and certain other NPS intellectual property related to PTH. In the event of a default by NPS under the Amendment and Restatement, DRI would be entitled to enforce its security interest against NPS and such intellectual property.

The Company determined the initial up-front purchase price is debt and is being amortized into earnings using the effective interest method over the estimated life. Accrued interest under the DRI agreement was $0 as of December 31, 2013 and 2012, respectively. The repayment of the remaining $42.8 million is secured solely by future royalty payments arising from sales of PTH by the Company. The PTH- secured debt is non-recourse to the Company.

REGPARA-secured Non-recourse Debt

As of December 31, 2013 and 2012, the outstanding principal balances on REGPARA-secured debt were $35.2 million and $36.3 million, respectively. In February 2010, the Company entered into an agreement with an affiliate of DRI, in which the Company sold to DRI its right to receive future royalty payments arising from sales of REGPARA® (cinacalcet HC1) under its license agreement with Kyowa Hakko Kirin. Under the agreement, DRI paid the Company an up-front purchase price of $38.4 million. If and when DRI receives two and a half times the amount paid to the Company, the agreement will terminate and the remainder of the royalties, if any, will revert back to the Company. In connection with the Company's February 2010 agreement with DRI, the Company granted DRI a security interest in its license agreement with Kyowa Hakko Kirin for REGPARA and certain of its patents and other intellectual property underlying that agreement. In the event of a default by NPS under the agreement with DRI, DRI would be entitled to enforce its security interest against NPS and the property described above. The Company determined the initial up-front purchase price is debt and is being amortized into earnings using the effective interest method over the estimated life of approximately 11 years. In accordance with the agreement, on March 1, 2010, DRI received the $2.1 million royalty owed to NPS for REGPARA sales during the six months ended December 31, 2009, which reduced the liability recorded for the DRI transaction to $36.3 million. As of December 31, 2013 and 2012, the Company classified $1.9 million and $0, respectively, of the REGPARA-secured debt as current based on royalty payments accrued as of December 31, 2013 and 2012, respectively. Accrued interest under the DRI agreement was $1.1 million and $3.1 million as of December 31, 2013 and 2012, respectively. Through December 31, 2013, $27.9 million has been paid to DRI. The repayment of the remaining $35.2 million is secured solely by future royalty payments arising from sales of REGPARA by Kyowa Hakko Kirin. The effective interest rate under the agreement, including issuance costs, is approximately 15.7%. The REGPARA-secured debt is non-recourse to the Company.

(c) Contractual maturities of long-term debt

The aggregate contractual maturities of long-term debt, including estimated maturities of the Non-recourse Debt, due subsequent to December 31, 2013 are as follows (in thousands):

Year ending December 31:            
     2014         $ 48,909 
     2015           31,334 
     2016           5,005 
     2017           4,648 
     2018           18,948 
     Thereafter           40,088 
          Total long-term debt         $ 148,932