Notes Receivable and Other Long-term Receivables	6 Months Ended
Jun. 30, 2014
Receivables [Abstract]
Notes and Other Long-term Receivables	6. Notes Receivable and Other Long-term Receivables Notes receivable and other long-term receivables included the following significant agreements: Wellstat Diagnostics Note Receivable and Credit Agreement In March 2012, the Company executed a $7.5 million two-year senior secured note receivable with the holders of the equity interests in Wellstat Diagnostics. In addition to bearing interest at 10% per annum, the note gave PDL certain rights to negotiate for certain future financing transactions. In August 2012, PDL and Wellstat Diagnostics amended the note receivable, providing a senior secured note receivable of $10.0 million, bearing interest at 12% per annum, to replace the original $7.5 million note. This $10.0 million note was repaid on November 2, 2012, using the proceeds of the $40.0 million credit facility entered into with the Company on the same date. On November 2, 2012, the Company and Wellstat Diagnostics entered into a $40.0 million credit agreement pursuant to which the Company is to accrue quarterly interest payments at the rate of 5% per annum (payable in cash or in kind). In addition, PDL will receive quarterly royalty payments based on a low double digit royalty rate of Wellstat Diagnostics' net revenues, generated by the sale, distribution or other use of Wellstat Diagnostics' products, if any, commencing upon the commercialization of its products. In January 2013, the Company was informed that, as of December 31, 2012, Wellstat Diagnostics had used funds contrary to the terms of the credit agreement and breached Sections 2.1.2 and 7 of the credit agreement. PDL sent Wellstat Diagnostics a notice of default on January 22, 2013, and accelerated the amounts owed under the credit agreement. In connection with the notice of default, PDL exercised one of its available remedies and transferred approximately $8.1 million of available cash from a bank account of Wellstat Diagnostics to PDL and applied the funds to amounts due under the credit agreement. On February 28, 2013, the parties entered into a forbearance agreement whereby PDL agreed to refrain from exercising additional remedies for 120 days while Wellstat Diagnostics raised funds to capitalize the business and the parties attempted to negotiate a revised credit agreement. PDL agreed to provide up to $7.9 million to Wellstat Diagnostics to fund the business for the 120-day forbearance period under the terms of the forbearance agreement. Following the conclusion of the forbearance period that ended on June 28, 2013, the Company agreed to forbear its exercise of remedies for additional periods of time to allow the owners and affiliates of Wellstat Diagnostics to complete a pending financing transaction. During such forbearance period, the Company provided approximately $1.3 million to Wellstat Diagnostics to fund ongoing operations of the business. During the year ended December 31, 2013, approximately $8.7 million was advanced pursuant to the forbearance agreement, and no further advances have been provided by the Company to Wellstat Diagnostics during the six months ended June 30, 2014. On August 15, 2013, the owners and affiliates of Wellstat Diagnostics completed a financing transaction to fulfill its obligations under the forbearance agreement. On August 15, 2013, the Company entered into an amended and restated credit agreement with Wellstat Diagnostics. The Company determined that the new agreement should be accounted for as a modification of the existing agreement. Except as otherwise described here, the material terms of the amended and restated credit agreement are substantially the same as those of the original credit agreement, including quarterly interest payments at the rate of 5% per annum (payable in cash or in kind). In addition, PDL will continue to receive quarterly royalty payments based on a low double digit royalty rate of Wellstat Diagnostics' net revenues. However, pursuant to the amended and restated credit agreement: (i) the principal amount was reset to approximately $44.1 million which was comprised of approximately $33.7 million original loan principal and interest, $1.3 million term loan principal and interest and $9.1 million forbearance principal and interest; (ii) the specified internal rates of return increased; (iii) the default interest rate was increased; (iv) Wellstat Diagnostics' obligation to provide certain financial information increased in frequency to monthly; (v) internal financial controls were strengthened by requiring Wellstat Diagnostics to maintain an independent, third-party financial professional with control over fund disbursements; (vi) the Company waived the existing events of default; and (vii) the owners and affiliates of Wellstat Diagnostics are required to contribute additional capital to Wellstat Diagnostics upon the sale of an affiliate entity. The amended and restated credit agreement continues to have an ultimate maturity date of December 31, 2021 (but may mature earlier upon certain specified events). When the principal amount was reset, a $2.5 million reduction of the carrying value was recorded as a financing cost as a component of interest and other income, net. The new carrying value is lower as a function of the variable nature of the internal rate of return to be realized by the Company based on when the note is repaid. The internal rate of return calculation, although increased, was reset when the credit agreement was amended and restated. In June of 2014, the Company received information from Wellstat Diagnostics that showed that it was generally unable to pay its debts as they became due. This constitutes an Event of Default under the amended and restated credit agreement. Wellstat Diagnostics entered into a transaction involving another lender, pursuant to which Wellstat Diagnostics obtained additional short term funding for its operations. At the same time, the Company entered into the First Amendment to Amended and Restated Credit Agreement with Wellstat Diagnostics. The material terms of the amendment include the following: (1) Wellstat Diagnostics acknowledged that an Event of Default had occurred, (2) the Company agreed to forbear from immediately enforcing its rights for up to sixty (60) days, so long as the other lender provided agreed levels of interim funding to Wellstat Diagnostics; and (3) the Company obtained specified additional information rights with regard to Wellstat Diagnostics’ financial matters and investment banking activities. On August 5, 2014, the Company received notice that the short term funding being provided pursuant to the agreement with the other lender entered into during June 2014, was being terminated. Wellstat Diagnostics remained in default because it was still unable to pay its debts as they became due. Accordingly, the Company delivered a notice of default to Wellstat Diagnostics, due to, inter alia, its on-going failure to pay its debts as they become due and Wellstat Diagnostics’ failure to comply with certain covenants included in the First Amendment to Amended and Restated Credit Agreement by the deadlines to which the parties had agreed (the Borrower Notice). The Borrower Notice accelerates all obligations under the amended and restated credit agreement and demands immediate payment in full in an amount equal to $53,939,820, (which amount, in accordance with the terms of the amended and restated credit agreement, includes an amount that, together with interest and royalty payments already made to the Company, would generate a specified internal rate of return to the Company), plus accruing fees, costs and interest, and demands that Wellstat Diagnostics protect and preserve all collateral securing its obligations. On August 7, 2014, the Company delivered a notice to each of the guarantors of Wellstat Diagnostics’ obligations to the Company under the credit agreement (the Guarantor Notice). The Guarantor Notice includes a demand that the guarantors remit payment to the Company in the amount of the outstanding obligations. The guarantors include certain affiliates and related companies of Wellstat Diagnostics, as well as Wellstat Diagnostics’ shareholders. The Company is evaluating the remedies available to it at this time. The amended and restated credit agreement is secured by a pledge of all of the assets of Wellstat Diagnostics, a pledge of all of Wellstat Diagnostics’ equity interests by the holders thereof, and a second lien on the assets of the affiliates of Wellstat Diagnostics. At June 30, 2014, and December 31, 2013, the carrying value of the note was included in non-current assets. As of June 30, 2014, the Company determined that its interest in Wellstat Diagnostics represented a variable interest in a Variable Interest Entity since Wellstat Diagnostics' equity was not sufficient to finance its operations without amounts advanced to it under the Company's note and forbearance agreement. However, the Company does not have the power to direct the activities of Wellstat Diagnostics that most significantly impacts Wellstat Diagnostic's economic performance and is not the primary beneficiary of Wellstat Diagnostics; therefore, Wellstat Diagnostics is not subject to consolidation. As of June 30, 2014, the carrying value of all amounts advanced to Wellstat Diagnostics including accrued interest through March 31, 2014, was $50.2 million, which was recorded in notes receivable. As of June 30, 2014, the maximum loss exposure was $50.2 million. As a result of the event of default, we ceased to accrued interest for the current period presented. We believe that Wellstat Diagnostics does not currently have sufficient capital to execute its business plan over the long term. Wellstat Diagnostics recently raised $2.5 million and has informed the Company that Wellstat Diagnostics is continuing to consider other sources of financing and strategic alternatives. The estimated fair value of the collateral is approximately $50.2 million. The estimated fair value of the collateral was determined by using a discounted cash flow analysis related to the underlying technology included in the collateral. The discounted cash flow was based upon expected income from sales of planned products over a period of 15 years. The terminal value was estimated using selected market multiples based on sales and EBITDA. Hyperion Agreement On January 27, 2012, PDL and Hyperion entered into an agreement whereby Hyperion sold to PDL the royalty streams due from SDK related to a certain patent license agreement between Hyperion and SDK dated December 31, 2008. The agreement assigned the patent license agreement royalty stream accruing from January 1, 2012 through December 31, 2013 to PDL in exchange for the lump sum payment to Hyperion of $2.3 million. In exchange for the lump sum payment, PDL was to receive two equal payments of $1.2 million on both March 5, 2013 and March 5, 2014. The first payment of $1.2 million was paid on March 5, 2013. The second and final payment of $1.2 million was due on March 5, 2014. Hyperion has not made the payment due on March 5, 2014. The inability to make this payment constitutes a breach of the purchase agreement. The Company completed an impairment analysis as of June 30, 2014. The estimated fair value of the collateral was determined to be in excess of that of the carrying value. Hyperion is considering other sources of financing and strategic alternatives, including selling the company. Depending on the outcome of its efforts and PDL's assessment of Hyperion's financial viability, we may recognize an impairment in a future period. Merus Labs Note Receivable and Credit Agreement In July 2012, PDL loaned $35.0 million to Merus Labs in connection with its acquisition of a commercial-stage pharmaceutical product and related assets. In addition, PDL agreed to provide a $20.0 million letter of credit on behalf of Merus Labs for the seller of the assets to draw upon to satisfy the remaining $20.0 million purchase price obligation. The seller made this draw on the letter of credit in July 2013 and an additional loan to Merus Labs for $20.0 million was recorded for an aggregate of $55.0 million in total borrowings. Outstanding borrowings under the July 2012 loan bore interest at the rate of 13.5% per annum and outstanding borrowings as a result of the draw on the letter of credit bore interest at the rate of 14.0% per annum. Merus Labs was required to make four periodic principal payments in respect of the July 2012 loan, with repayment of the remaining principal balance of all loans due on March 31, 2015. The borrowings were subject to mandatory prepayments upon certain asset dispositions or debt issuances as set forth in the credit agreement. Merus Labs made the first of these payments in December 2012 in the amount of $5.0 million, and made the second payment in June 2013 in the amount of $7.5 million. In September 2013, Merus Labs prepaid in full its obligations under the credit agreement, including accrued interest through the payment date and a prepayment fee of 1% of the aggregate principal amount outstanding at the time of repayment. There was no outstanding balance owed as of June 30, 2014. AxoGen Note Receivable and AxoGen Royalty Agreement In October 2012, PDL entered into the AxoGen Royalty Agreement with AxoGen pursuant to which the Company will receive specified royalties on AxoGen’s net revenues (as defined in the AxoGen Royalty Agreement) generated by the sale, distribution or other use of AxoGen’s products. The AxoGen Royalty Agreement has an eight year term and provides PDL with royalties of 9.95% based on AxoGen's net revenues, subject to agreed-upon guaranteed quarterly minimum payments of approximately $1.3 to $2.5 million beginning in the fourth quarter of 2014, and the right to require AxoGen to repurchase the AxoGen Royalty Agreement at the end of the fourth year. AxoGen has been granted certain rights to call the contract in years five through eight. The total consideration PDL paid to AxoGen for the royalty rights was $20.8 million, including an interim funding of $1.8 million in August 2012. AxoGen was required to use a portion of the proceeds from the AxoGen Royalty Agreement to pay the outstanding balance under its existing credit facility. AxoGen plans to use the remainder of the proceeds to support the business plan for its products. The royalty rights are secured by the cash and accounts receivable of AxoGen. Under the AxoGen Royalty Agreement, beginning on October 1, 2016, or in the event of the occurrence of a material adverse event, AxoGen's bankruptcy or material breach of the AxoGen Royalty Agreement, the Company may require AxoGen to repurchase the royalty rights at a price that, together with payments already made by AxoGen, would generate a specified internal rate of return to the Company. The Company has concluded that the repurchase option is an embedded derivative which should be bifurcated and separately accounted for at fair value. In the event of a change of control, AxoGen must repurchase the assigned interests from the Company for a repurchase price equal to an amount that, together with payments already made by AxoGen, would generate a 32.5% internal rate of return to the Company. The Company has concluded that the change of control provision is an embedded derivative that should be bifurcated and separately recorded at its estimated fair value. The estimated fair value of the change of control provision was approximately $1.2 million and $1.1 million as of June 30, 2014, and December 31, 2013, respectively. The estimated fair value of this embedded derivative is included in the carrying value of the AxoGen note receivable. The Company recognized gains of approximately $0.1 million and $0.4 million related to the change in the estimated fair value of embedded derivative during the three month periods ended June 30, 2014 and 2013, respectively. The Company recognized gains of approximately $0.1 million and $0.4 million related to the change in the estimated fair value of embedded derivative during the six month periods ended June 30, 2014 and 2013, respectively. At any time after September 30, 2016, AxoGen, at its option, can repurchase the assigned interests under the AxoGen Royalty Agreement for a price applicable in a change of control. During the term of the AxoGen Royalty Agreement, the Company is entitled to designate an individual to be a member of AxoGen's board of directors. The Company has exercised this right and on October 5, 2012, upon the close of the transaction, the Company's President and Chief Executive Officer was elected to AxoGen's board of directors. On August 14, 2013, PDL purchased 1,166,666 shares of AXGN at $3.00 per share, totaling $3.5 million. The shares are classified as available for sale and recorded as short term investments on the balance sheet. As of June 30, 2014, the shares were valued at $3.2 million, which resulted in an unrealized loss of $0.3 million and is recorded in other comprehensive loss. Avinger Note Receivable and Royalty Agreement On April 18, 2013, PDL entered into a credit agreement with Avinger, under which we made available to Avinger up to $40.0 million to be used by Avinger in connection with the commercialization of its lumivascular catheter devices and the development of Avinger's lumivascular atherectomy device. Of the $40.0 million initially available to Avinger, we funded an initial $20.0 million, net of fees, at the close of the transaction. The additional $20.0 million in the form of a second tranche is no longer available to Avinger. Outstanding borrowings under the initial loan bear interest at a stated rate of 12% per annum. Avinger is required to make quarterly interest and principal payments. Principal repayment will commence on: (i) the eleventh interest payment date if the revenue milestone is not achieved or (ii) the thirteenth interest payment date if the revenue milestone is achieved. The principal amount outstanding at commencement of repayment, after taking into account any payment-in-kind, will be repaid in equal installments until final maturity of the loan. The loan will mature in April 2018. In connection with entering into the credit agreement, the Company will receive a low, single-digit royalty on Avinger's net revenues through April 2018. Avinger may prepay the outstanding principal and accrued interest on the note receivable at any time. If Avinger repays the note receivable prior to April 2018, the royalty on Avinger's net revenues will be reduced by 50% and will be subject to certain minimum payments from the prepayment date through April 2018. The obligations under the credit agreement are secured by a pledge of substantially all of the assets of Avinger and any of its subsidiaries (other than controlled foreign corporations, if any). The credit agreement provides for a number of standard events of default, including payment, bankruptcy, covenant, representation and warranty and judgment defaults. LENSAR Credit Agreement On October 1, 2013, PDL entered into a credit agreement with LENSAR, under which PDL made available to LENSAR up to $60 million to be used by LENSAR in connection with the commercialization of its currently marketed LENSAR™ Laser System. Of the $60 million available to LENSAR, an initial $40 million, net of fees, was funded by the Company at the close of the transaction. Upon attainment by LENSAR of a specified sales milestone to be accomplished no later than September 30, 2014, PDL will fund LENSAR an additional $20 million. Outstanding borrowings under the loans bear interest at the rate of 15.5% per annum, payable quarterly in arrears. Principal repayment will commence on the thirteenth interest payment date or December 31, 2016. The principal amount outstanding at the commencement of repayment will be repaid in equal installments until final maturity of the loans. The loans will mature on October 1, 2018. LENSAR may elect to prepay the loans at any time, subject to a prepayment penalty that decreases over the life of the loans. The loans are secured by all of the assets of LENSAR. Durata Credit Agreement On October 31, 2013, PDL entered into a credit agreement with Durata, under which the Company made available to Durata up to $70.0 million. Of the $70.0 million available to Durata, an initial $25.0 million (tranche one), net of fees, was funded by the Company at the close of the transaction. On May 27, 2014, the Company funded Durata an additional $15 million (tranche two) as a result of Durata's marketing approval of dalbavancin in the United States, which occurred on May 23, 2014, and was the milestone needed to receive the tranche two funding. Within 9 months after the occurrence of the tranche two milestone, Durata may request up to a single additional $30 million borrowing. Until the occurrence of the tranche two milestone, outstanding borrowings under tranche one bore interest at the rate of 14.0% per annum, payable quarterly in arrears. Upon occurrence of the tranche two milestone, the interest rate of the loans decreased to 12.75%. Principal repayment will commence on the fifth interest payment date, March 31, 2015. The principal amount outstanding will be repaid quarterly over the remainder of the loans in an increasing percentage of the principal outstanding at commencement of repayment. The loans will mature on October 31, 2018. Durata may elect to prepay the loans at any time, subject to a prepayment penalty that decreases over the life of the loans. The Company is entitled to receive a fee in addition to the prepayment penalty in the event that Durata undergoes a change in control. The obligations under the credit agreement are secured by a pledge of substantially all of the assets of Durata. Direct Flow Credit Agreement On November 5, 2013, PDL entered into a credit agreement with Direct Flow Medical, under which PDL will provide up to $50.0 million to Direct Flow Medical. Of the $50.0 million available to Direct Flow Medical, an initial $35.0 million (tranche one), net of fees, was funded by the Company at the close of the transaction. Upon the attainment of a specified revenue milestone to be accomplished no later than December 31, 2014 (the tranche two milestone), the Company will fund Direct Flow Medical an additional $15.0 million, net of fees. Until the occurrence of the tranche two milestone, outstanding borrowings under tranche one bear interest at the rate of 15.5% per annum, payable quarterly in arrears. Upon occurrence of the tranche two milestone, the interest rate of the loans will decrease to 13.5%. Principal repayment will commence on the twelfth interest payment date, September 30, 2016. The principal amount outstanding at commencement of repayment will be repaid in equal installments until final maturity of the loans. The loans will mature on November 5, 2018. Direct Flow Medical may elect to prepay the loans at any time, subject to a prepayment penalty that decreases over the life of the loans. The obligations under the credit agreement are secured by a pledge of substantially all of the assets of Direct Flow Medical and any of its subsidiaries. Paradigm Spine Credit Agreement On February 14, 2014, the Company entered into a credit agreement with Paradigm Spine, under which it made available to Paradigm Spine up to $75.0 million to be used by Paradigm Spine to refinance its existing credit facility and expand its domestic commercial operations. Of the $75.0 million available to Paradigm Spine, an initial $50 million, net of fees, was funded by the Company at the close of the transaction. Upon the attainment of specified sales and other milestones before December 31, 2014, the Company will fund Paradigm Spine between an additional $6.25 million and $12.5 million, at Paradigm Spine’s discretion. Upon the attainment of specified sales and other milestones before June 30, 2015, the Company will fund Paradigm Spine up to an additional $12.5 million, also at Paradigm Spine’s discretion. Borrowings under the credit agreement bear interest at the rate of 13.0% per annum, payable quarterly in arrears. Principal repayment will commence on the twelfth interest payment date, December 31, 2016. The principal amount outstanding at commencement of repayment will be repaid in equal installments until final maturity of the loans. The loans will mature on February 14, 2019, or, if Paradigm Spine has achieved the first milestone and the additional loan amount is provided to Paradigm, the loans will mature on August 14, 2019. Paradigm Spine may elect to prepay the loans at any time, subject to a prepayment penalty that decreases over the life of the loans. The obligations under the credit agreement are secured by a pledge of substantially all of the assets of Paradigm Spine and its domestic subsidiaries and, initially, certain assets of Paradigm Spine’s German subsidiaries. kaléo Note Purchase Agreement On April 1, 2014, PDL entered into a note purchase agreement with Accel 300, a wholly-owned subsidiary of kaléo, pursuant to which the Company acquired $150 million of secured notes due 2029. The secured notes were issued pursuant to an indenture between Accel 300 and U.S. Bank, National Association, as trustee, and are secured by 100 percent of the royalties from kaléo’s first approved product, Auvi-Q™ (epinephrine auto-injection, USP) (known as Allerject in Canada), 10 percent of net sales of kaléo’s second proprietary auto-injector based product, EVZIO (naloxone hydrochloride injection) (collectively, the "Revenue Interests"), and by a pledge of kaléo’s equity ownership in Accel 300. The secured notes bear interest at 13 percent per annum, paid quarterly in arrears on principal outstanding. The principal balance of the secured notes is repaid to the extent that the Revenue Interests exceed the quarterly interest payment, as limited by a quarterly payment cap. The final maturity of the secured notes is March 2029. Kaléo may redeem the secured notes at any time, subject to a redemption premium. For carrying value and fair value information related to our notes receivable and other long-term receivables, see Note 3.

6. Notes Receivable and Other Long-term Receivables

Notes receivable and other long-term receivables included the following significant agreements:

Wellstat Diagnostics Note Receivable and Credit Agreement

In March 2012, the Company executed a $7.5 million two-year senior secured note receivable with the holders of the equity interests in Wellstat Diagnostics. In addition to bearing interest at 10% per annum, the note gave PDL certain rights to negotiate for certain future financing transactions. In August 2012, PDL and Wellstat Diagnostics amended the note receivable, providing a senior secured note receivable of $10.0 million, bearing interest at 12% per annum, to replace the original $7.5 million note. This $10.0 million note was repaid on November 2, 2012, using the proceeds of the $40.0 million credit facility entered into with the Company on the same date.

On November 2, 2012, the Company and Wellstat Diagnostics entered into a $40.0 million credit agreement pursuant to which the Company is to accrue quarterly interest payments at the rate of 5% per annum (payable in cash or in kind). In addition, PDL will receive quarterly royalty payments based on a low double digit royalty rate of Wellstat Diagnostics' net revenues, generated by the sale, distribution or other use of Wellstat Diagnostics' products, if any, commencing upon the commercialization of its products.

In January 2013, the Company was informed that, as of December 31, 2012, Wellstat Diagnostics had used funds contrary to the terms of the credit agreement and breached Sections 2.1.2 and 7 of the credit agreement. PDL sent Wellstat Diagnostics a notice of default on January 22, 2013, and accelerated the amounts owed under the credit agreement. In connection with the notice of default, PDL exercised one of its available remedies and transferred approximately $8.1 million of available cash from a bank account of Wellstat Diagnostics to PDL and applied the funds to amounts due under the credit agreement. On February 28, 2013, the parties entered into a forbearance agreement whereby PDL agreed to refrain from exercising additional remedies for 120 days while Wellstat Diagnostics raised funds to capitalize the business and the parties attempted to negotiate a revised credit agreement. PDL agreed to provide up to $7.9 million to Wellstat Diagnostics to fund the business for the 120-day forbearance period under the terms of the forbearance agreement. Following the conclusion of the forbearance period that ended on June 28, 2013, the Company agreed to forbear its exercise of remedies for additional periods of time to allow the owners and affiliates of Wellstat Diagnostics to complete a pending financing transaction. During such forbearance period, the Company provided approximately $1.3 million to Wellstat Diagnostics to fund ongoing operations of the business. During the year ended December 31, 2013, approximately $8.7 million was advanced pursuant to the forbearance agreement, and no further advances have been provided by the Company to Wellstat Diagnostics during the six months ended June 30, 2014.

On August 15, 2013, the owners and affiliates of Wellstat Diagnostics completed a financing transaction to fulfill its obligations under the forbearance agreement. On August 15, 2013, the Company entered into an amended and restated credit agreement with Wellstat Diagnostics. The Company determined that the new agreement should be accounted for as a modification of the existing agreement.

Except as otherwise described here, the material terms of the amended and restated credit agreement are substantially the same as those of the original credit agreement, including quarterly interest payments at the rate of 5% per annum (payable in cash or in kind). In addition, PDL will continue to receive quarterly royalty payments based on a low double digit royalty rate of Wellstat Diagnostics' net revenues. However, pursuant to the amended and restated credit agreement: (i) the principal amount was reset to approximately $44.1 million which was comprised of approximately $33.7 million original loan principal and interest, $1.3 million term loan principal and interest and $9.1 million forbearance principal and interest; (ii) the specified internal rates of return increased; (iii) the default interest rate was increased; (iv) Wellstat Diagnostics' obligation to provide certain financial information increased in frequency to monthly; (v) internal financial controls were strengthened by requiring Wellstat Diagnostics to maintain an independent, third-party financial professional with control over fund disbursements; (vi) the Company waived the existing events of default; and (vii) the owners and affiliates of Wellstat Diagnostics are required to contribute additional capital to Wellstat Diagnostics upon the sale of an affiliate entity. The amended and restated credit agreement continues to have an ultimate maturity date of December 31, 2021 (but may mature earlier upon certain specified events).

When the principal amount was reset, a $2.5 million reduction of the carrying value was recorded as a financing cost as a component of interest and other income, net. The new carrying value is lower as a function of the variable nature of the internal rate of return to be realized by the Company based on when the note is repaid. The internal rate of return calculation, although increased, was reset when the credit agreement was amended and restated.

In June of 2014, the Company received information from Wellstat Diagnostics that showed that it was generally unable to pay its debts as they became due. This constitutes an Event of Default under the amended and restated credit agreement. Wellstat Diagnostics entered into a transaction involving another lender, pursuant to which Wellstat Diagnostics obtained additional short term funding for its operations. At the same time, the Company entered into the First Amendment to Amended and Restated Credit Agreement with Wellstat Diagnostics. The material terms of the amendment include the following: (1) Wellstat Diagnostics acknowledged that an Event of Default had occurred, (2) the Company agreed to forbear from immediately enforcing its rights for up to sixty (60) days, so long as the other lender provided agreed levels of interim funding to Wellstat Diagnostics; and (3) the Company obtained specified additional information rights with regard to Wellstat Diagnostics’ financial matters and investment banking activities.

On August 5, 2014, the Company received notice that the short term funding being provided pursuant to the agreement with the other lender entered into during June 2014, was being terminated. Wellstat Diagnostics remained in default because it was still unable to pay its debts as they became due. Accordingly, the Company delivered a notice of default to Wellstat Diagnostics, due to, inter alia, its on-going failure to pay its debts as they become due and Wellstat Diagnostics’ failure to comply with certain covenants included in the First Amendment to Amended and Restated Credit Agreement by the deadlines to which the parties had agreed (the Borrower Notice). The Borrower Notice accelerates all obligations under the amended and restated credit agreement and demands immediate payment in full in an amount equal to $53,939,820, (which amount, in accordance with the terms of the amended and restated credit agreement, includes an amount that, together with interest and royalty payments already made to the Company, would generate a specified internal rate of return to the Company), plus accruing fees, costs and interest, and demands that Wellstat Diagnostics protect and preserve all collateral securing its obligations. On August 7, 2014, the Company delivered a notice to each of the guarantors of Wellstat Diagnostics’ obligations to the Company under the credit agreement (the Guarantor Notice). The Guarantor Notice includes a demand that the guarantors remit payment to the Company in the amount of the outstanding obligations. The guarantors include certain affiliates and related companies of Wellstat Diagnostics, as well as Wellstat Diagnostics’ shareholders. The Company is evaluating the remedies available to it at this time.

The amended and restated credit agreement is secured by a pledge of all of the assets of Wellstat Diagnostics, a pledge of all of Wellstat Diagnostics’ equity interests by the holders thereof, and a second lien on the assets of the affiliates of Wellstat Diagnostics.

At June 30, 2014, and December 31, 2013, the carrying value of the note was included in non-current assets.

As of June 30, 2014, the Company determined that its interest in Wellstat Diagnostics represented a variable interest in a Variable Interest Entity since Wellstat Diagnostics' equity was not sufficient to finance its operations without amounts advanced to it under the Company's note and forbearance agreement. However, the Company does not have the power to direct the activities of Wellstat Diagnostics that most significantly impacts Wellstat Diagnostic's economic performance and is not the primary beneficiary of Wellstat Diagnostics; therefore, Wellstat Diagnostics is not subject to consolidation.

As of June 30, 2014, the carrying value of all amounts advanced to Wellstat Diagnostics including accrued interest through March 31, 2014, was $50.2 million, which was recorded in notes receivable. As of June 30, 2014, the maximum loss exposure was $50.2 million. As a result of the event of default, we ceased to accrued interest for the current period presented.

We believe that Wellstat Diagnostics does not currently have sufficient capital to execute its business plan over the long term. Wellstat Diagnostics recently raised $2.5 million and has informed the Company that Wellstat Diagnostics is continuing to consider other sources of financing and strategic alternatives.

The estimated fair value of the collateral is approximately $50.2 million. The estimated fair value of the collateral was determined by using a discounted cash flow analysis related to the underlying technology included in the collateral. The discounted cash flow was based upon expected income from sales of planned products over a period of 15 years. The terminal value was estimated using selected market multiples based on sales and EBITDA.

Hyperion Agreement

On January 27, 2012, PDL and Hyperion entered into an agreement whereby Hyperion sold to PDL the royalty streams due from SDK related to a certain patent license agreement between Hyperion and SDK dated December 31, 2008. The agreement assigned the patent license agreement royalty stream accruing from January 1, 2012 through December 31, 2013 to PDL in exchange for the lump sum payment to Hyperion of $2.3 million. In exchange for the lump sum payment, PDL was to receive two equal payments of $1.2 million on both March 5, 2013 and March 5, 2014. The first payment of $1.2 million was paid on March 5, 2013. The second and final payment of $1.2 million was due on March 5, 2014. Hyperion has not made the payment due on March 5, 2014. The inability to make this payment constitutes a breach of the purchase agreement. The Company completed an impairment analysis as of June 30, 2014. The estimated fair value of the collateral was determined to be in excess of that of the carrying value. Hyperion is considering other sources of financing and strategic alternatives, including selling the company. Depending on the outcome of its efforts and PDL's assessment of Hyperion's financial viability, we may recognize an impairment in a future period.

Merus Labs Note Receivable and Credit Agreement

In July 2012, PDL loaned $35.0 million to Merus Labs in connection with its acquisition of a commercial-stage pharmaceutical product and related assets. In addition, PDL agreed to provide a $20.0 million letter of credit on behalf of Merus Labs for the seller of the assets to draw upon to satisfy the remaining $20.0 million purchase price obligation. The seller made this draw on the letter of credit in July 2013 and an additional loan to Merus Labs for $20.0 million was recorded for an aggregate of $55.0 million in total borrowings.

Outstanding borrowings under the July 2012 loan bore interest at the rate of 13.5% per annum and outstanding borrowings as a result of the draw on the letter of credit bore interest at the rate of 14.0% per annum. Merus Labs was required to make four periodic principal payments in respect of the July 2012 loan, with repayment of the remaining principal balance of all loans due on March 31, 2015. The borrowings were subject to mandatory prepayments upon certain asset dispositions or debt issuances as set forth in the credit agreement. Merus Labs made the first of these payments in December 2012 in the amount of $5.0 million, and made the second payment in June 2013 in the amount of $7.5 million.

In September 2013, Merus Labs prepaid in full its obligations under the credit agreement, including accrued interest through the payment date and a prepayment fee of 1% of the aggregate principal amount outstanding at the time of repayment. There was no outstanding balance owed as of June 30, 2014.

AxoGen Note Receivable and AxoGen Royalty Agreement

In October 2012, PDL entered into the AxoGen Royalty Agreement with AxoGen pursuant to which the Company will receive specified royalties on AxoGen’s net revenues (as defined in the AxoGen Royalty Agreement) generated by the sale, distribution or other use of AxoGen’s products. The AxoGen Royalty Agreement has an eight year term and provides PDL with royalties of 9.95% based on AxoGen's net revenues, subject to agreed-upon guaranteed quarterly minimum payments of approximately $1.3 to $2.5 million beginning in the fourth quarter of 2014, and the right to require AxoGen to repurchase the AxoGen Royalty Agreement at the end of the fourth year. AxoGen has been granted certain rights to call the contract in years five through eight. The total consideration PDL paid to AxoGen for the royalty rights was $20.8 million, including an interim funding of $1.8 million in August 2012. AxoGen was required to use a portion of the proceeds from the AxoGen Royalty Agreement to pay the outstanding balance under its existing credit facility. AxoGen plans to use the remainder of the proceeds to support the business plan for its products. The royalty rights are secured by the cash and accounts receivable of AxoGen.

Under the AxoGen Royalty Agreement, beginning on October 1, 2016, or in the event of the occurrence of a material adverse event, AxoGen's bankruptcy or material breach of the AxoGen Royalty Agreement, the Company may require AxoGen to repurchase the royalty rights at a price that, together with payments already made by AxoGen, would generate a specified internal rate of return to the Company. The Company has concluded that the repurchase option is an embedded derivative which should be bifurcated and separately accounted for at fair value.

In the event of a change of control, AxoGen must repurchase the assigned interests from the Company for a repurchase price equal to an amount that, together with payments already made by AxoGen, would generate a 32.5% internal rate of return to the Company. The Company has concluded that the change of control provision is an embedded derivative that should be bifurcated and separately recorded at its estimated fair value. The estimated fair value of the change of control provision was approximately $1.2 million and $1.1 million as of June 30, 2014, and December 31, 2013, respectively. The estimated fair value of this embedded derivative is included in the carrying value of the AxoGen note receivable. The Company recognized gains of approximately $0.1 million and $0.4 million related to the change in the estimated fair value of embedded derivative during the three month periods ended June 30, 2014 and 2013, respectively. The Company recognized gains of approximately $0.1 million and $0.4 million related to the change in the estimated fair value of embedded derivative during the six month periods ended June 30, 2014 and 2013, respectively.

At any time after September 30, 2016, AxoGen, at its option, can repurchase the assigned interests under the AxoGen Royalty Agreement for a price applicable in a change of control.

During the term of the AxoGen Royalty Agreement, the Company is entitled to designate an individual to be a member of AxoGen's board of directors. The Company has exercised this right and on October 5, 2012, upon the close of the transaction, the Company's President and Chief Executive Officer was elected to AxoGen's board of directors.

On August 14, 2013, PDL purchased 1,166,666 shares of AXGN at $3.00 per share, totaling $3.5 million. The shares are classified as available for sale and recorded as short term investments on the balance sheet. As of June 30, 2014, the shares were valued at $3.2 million, which resulted in an unrealized loss of $0.3 million and is recorded in other comprehensive loss.

Avinger Note Receivable and Royalty Agreement

On April 18, 2013, PDL entered into a credit agreement with Avinger, under which we made available to Avinger up to $40.0 million to be used by Avinger in connection with the commercialization of its lumivascular catheter devices and the development of Avinger's lumivascular atherectomy device. Of the $40.0 million initially available to Avinger, we funded an initial $20.0 million, net of fees, at the close of the transaction. The additional $20.0 million in the form of a second tranche is no longer available to Avinger. Outstanding borrowings under the initial loan bear interest at a stated rate of 12% per annum.

Avinger is required to make quarterly interest and principal payments. Principal repayment will commence on: (i) the eleventh interest payment date if the revenue milestone is not achieved or (ii) the thirteenth interest payment date if the revenue milestone is achieved. The principal amount outstanding at commencement of repayment, after taking into account any payment-in-kind, will be repaid in equal installments until final maturity of the loan. The loan will mature in April 2018.

In connection with entering into the credit agreement, the Company will receive a low, single-digit royalty on Avinger's net revenues through April 2018. Avinger may prepay the outstanding principal and accrued interest on the note receivable at any time. If Avinger repays the note receivable prior to April 2018, the royalty on Avinger's net revenues will be reduced by 50% and will be subject to certain minimum payments from the prepayment date through April 2018.

The obligations under the credit agreement are secured by a pledge of substantially all of the assets of Avinger and any of its subsidiaries (other than controlled foreign corporations, if any). The credit agreement provides for a number of standard events of default, including payment, bankruptcy, covenant, representation and warranty and judgment defaults.

LENSAR Credit Agreement

On October 1, 2013, PDL entered into a credit agreement with LENSAR, under which PDL made available to LENSAR up to $60 million to be used by LENSAR in connection with the commercialization of its currently marketed LENSAR™ Laser System. Of the $60 million available to LENSAR, an initial $40 million, net of fees, was funded by the Company at the close of the transaction. Upon attainment by LENSAR of a specified sales milestone to be accomplished no later than September 30, 2014, PDL will fund LENSAR an additional $20 million. Outstanding borrowings under the loans bear interest at the rate of 15.5% per annum, payable quarterly in arrears.

Principal repayment will commence on the thirteenth interest payment date or December 31, 2016. The principal amount outstanding at the commencement of repayment will be repaid in equal installments until final maturity of the loans. The loans will mature on October 1, 2018. LENSAR may elect to prepay the loans at any time, subject to a prepayment penalty that decreases over the life of the loans. The loans are secured by all of the assets of LENSAR.

Durata Credit Agreement

On October 31, 2013, PDL entered into a credit agreement with Durata, under which the Company made available to Durata up to $70.0 million. Of the $70.0 million available to Durata, an initial $25.0 million (tranche one), net of fees, was funded by the Company at the close of the transaction. On May 27, 2014, the Company funded Durata an additional $15 million (tranche two) as a result of Durata's marketing approval of dalbavancin in the United States, which occurred on May 23, 2014, and was the milestone needed to receive the tranche two funding. Within 9 months after the occurrence of the tranche two milestone, Durata may request up to a single additional $30 million borrowing. Until the occurrence of the tranche two milestone, outstanding borrowings under tranche one bore interest at the rate of 14.0% per annum, payable quarterly in arrears. Upon occurrence of the tranche two milestone, the interest rate of the loans decreased to 12.75%.

Principal repayment will commence on the fifth interest payment date, March 31, 2015. The principal amount outstanding will be repaid quarterly over the remainder of the loans in an increasing percentage of the principal outstanding at commencement of repayment. The loans will mature on October 31, 2018. Durata may elect to prepay the loans at any time, subject to a prepayment penalty that decreases over the life of the loans. The Company is entitled to receive a fee in addition to the prepayment penalty in the event that Durata undergoes a change in control. The obligations under the credit agreement are secured by a pledge of substantially all of the assets of Durata.

Direct Flow Credit Agreement

On November 5, 2013, PDL entered into a credit agreement with Direct Flow Medical, under which PDL will provide up to $50.0 million to Direct Flow Medical. Of the $50.0 million available to Direct Flow Medical, an initial $35.0 million (tranche one), net of fees, was funded by the Company at the close of the transaction. Upon the attainment of a specified revenue milestone to be accomplished no later than December 31, 2014 (the tranche two milestone), the Company will fund Direct Flow Medical an additional $15.0 million, net of fees. Until the occurrence of the tranche two milestone, outstanding borrowings under tranche one bear interest at the rate of 15.5% per annum, payable quarterly in arrears. Upon occurrence of the tranche two milestone, the interest rate of the loans will decrease to 13.5%.

Principal repayment will commence on the twelfth interest payment date, September 30, 2016. The principal amount outstanding at commencement of repayment will be repaid in equal installments until final maturity of the loans. The loans will mature on November 5, 2018. Direct Flow Medical may elect to prepay the loans at any time, subject to a prepayment penalty that decreases over the life of the loans. The obligations under the credit agreement are secured by a pledge of substantially all of the assets of Direct Flow Medical and any of its subsidiaries.

Paradigm Spine Credit Agreement

On February 14, 2014, the Company entered into a credit agreement with Paradigm Spine, under which it made available to Paradigm Spine up to $75.0 million to be used by Paradigm Spine to refinance its existing credit facility and expand its domestic commercial operations. Of the $75.0 million available to Paradigm Spine, an initial $50 million, net of fees, was funded by the Company at the close of the transaction. Upon the attainment of specified sales and other milestones before December 31, 2014, the Company will fund Paradigm Spine between an additional $6.25 million and $12.5 million, at Paradigm Spine’s discretion. Upon the attainment of specified sales and other milestones before June 30, 2015, the Company will fund Paradigm Spine up to an additional $12.5 million, also at Paradigm Spine’s discretion. Borrowings under the credit agreement bear interest at the rate of 13.0% per annum, payable quarterly in arrears.

Principal repayment will commence on the twelfth interest payment date, December 31, 2016. The principal amount outstanding at commencement of repayment will be repaid in equal installments until final maturity of the loans. The loans will mature on February 14, 2019, or, if Paradigm Spine has achieved the first milestone and the additional loan amount is provided to Paradigm, the loans will mature on August 14, 2019. Paradigm Spine may elect to prepay the loans at any time, subject to a prepayment penalty that decreases over the life of the loans. The obligations under the credit agreement are secured by a pledge of substantially all of the assets of Paradigm Spine and its domestic subsidiaries and, initially, certain assets of Paradigm Spine’s German subsidiaries.

kaléo Note Purchase Agreement

On April 1, 2014, PDL entered into a note purchase agreement with Accel 300, a wholly-owned subsidiary of kaléo, pursuant to which the Company acquired $150 million of secured notes due 2029. The secured notes were issued pursuant to an indenture between Accel 300 and U.S. Bank, National Association, as trustee, and are secured by 100 percent of the royalties from kaléo’s first approved product, Auvi-Q™ (epinephrine auto-injection, USP) (known as Allerject in Canada), 10 percent of net sales of kaléo’s second proprietary auto-injector based product, EVZIO (naloxone hydrochloride injection) (collectively, the "Revenue Interests"), and by a pledge of kaléo’s equity ownership in Accel 300.

The secured notes bear interest at 13 percent per annum, paid quarterly in arrears on principal outstanding. The principal balance of the secured notes is repaid to the extent that the Revenue Interests exceed the quarterly interest payment, as limited by a quarterly payment cap. The final maturity of the secured notes is March 2029. Kaléo may redeem the secured notes at any time, subject to a redemption premium.

For carrying value and fair value information related to our notes receivable and other long-term receivables, see Note 3.