
	September 30,		December 31,
	2011		2010
	(in thousands)
MHR Convertible Notes	$	23,914	$	19,864
MHR Promissory Notes		561		521

	$	24,475	$	20,385

MHR Convertible Notes. On September 26, 2005, we received net proceeds of approximately $12.9 million under a $15 million secured loan agreement (the “Loan Agreement”) executed with MHR Fund Management LLC (together with its affiliates, “MHR”). Under the Loan Agreement, MHR requested, and on May 16, 2006, we effected, the exchange of the loan from MHR for senior secured convertible notes (the “MHR Convertible Notes”) with substantially the same terms as the Loan Agreement, except that the MHR Convertible Notes are convertible, at the sole discretion of MHR, into shares of our common stock at a price per share of $3.78. As of September 30, 2011, the MHR Convertible Notes were convertible into 7,246,873 shares of our common stock. The MHR Convertible Notes are due on September 26, 2012, bear interest at 11% and are collateralized by a first priority lien in favor of MHR on substantially all of our assets. Interest is payable in the form of additional MHR Convertible Notes rather than in cash. Effective September 27, 2011, the MHR Convertible Notes were reclassified as a short term liability in accordance with their September 26, 2012 maturity date.

In connection with the Loan Agreement, we amended MHR’s previously existing warrants to purchase 387,374 shares of common stock (“MHR 2005 Warrants”) to provide additional anti-dilution protection. We also granted MHR the option (“MHR Option”) to purchase warrants for up to 617,211 shares of our common stock. The MHR Option was exercised during April 2006 whereby MHR acquired 617,211 warrants (“MHR 2006 Warrants”) to acquire an equal number of shares of common stock. The exercise price for the MHR Option was $0.01 per warrant for the first 67,084 warrants and $1.00 per warrant for each additional warrant. See Note 10 for a further discussion of the liability related to these warrants.

Total issuance costs associated with the Loan Agreement were $2.1 million, of which $1.9 million were allocated to the MHR Convertible Notes, and $0.2 million were allocated to the related derivative instruments. Of the $1.9 million allocated to the MHR Convertible Notes, $1.4 million represents reimbursement of MHR’s legal fees and $0.5 million represents our legal and other transaction costs. The $1.4 million paid on behalf of the lender has been recorded as a reduction of the face value of the note, while the $0.5 million of our costs has been recorded as deferred financing costs.

The MHR Convertible Notes provide MHR with the right to require us to redeem the notes in the event of a change in control. The change in control redemption feature has been determined to be an embedded derivative instrument which must be separated from the host contract. For the year ended December 31, 2006, the fair value of the change in control redemption feature was estimated using a combination of a put option model for the penalties and the Black-Scholes model for the conversion option that would exist under the MHR Convertible Notes. The estimate resulted in a value that was de minimis and, therefore, no separate liability was recorded. Changes in the assumptions used to estimate the fair value of this derivative instrument, in particular the probability that a change in control will occur, could result in a material change to the fair value of the instrument. For the nine months ended September 30, 2011 and for the years ended December 31, 2010, 2009 and 2008, management determined the probability of exercise of the right due to change in control to be remote. The fair value of the change in control redemption feature is de minimis.

In connection with the MHR Convertible Notes financing, the Company agreed to appoint a representative of MHR (“MHR Nominee”) and another person (the “Mutual Director”) to its Board of Directors. Further, the Company agreed to amend, and in January 2006 did amend, its certificate of incorporation to provide for continuity of the MHR Nominee and the Mutual Nominee on the Board, as described therein, so long as MHR holds at least 2% of the outstanding common stock of the Company.

The MHR Convertible Notes provide for various events of default including the failure to perfect any of the liens in favor of MHR, failure to observe any covenant or agreement, failure to maintain the listing and trading of our common stock, sale of a substantial portion of our assets, merger with another entity without the prior consent of MHR, or any governmental action that renders us unable to honor or perform our obligations under the Loan Agreement or results in a material adverse effect on our operations. If an event of default occurs, the MHR Convertible Notes provide for the immediate repayment and certain additional amounts as set forth in the MHR Convertible Notes. We currently have a waiver from MHR for failure to perfect liens on certain intellectual property rights through September 26, 2012.

Effective January 1, 2009, the Company adopted the provisions of the Financial Accounting Standards Board (“FASB”) Accounting Codification Topic 815-40-15-5, Evaluating Whether an Instrument Involving a Contingency is Considered Indexed to an Entity’s Own Stock (“FASB ASC 815-40-15-5”). Under FASB ASC 815-40-15-5, the conversion feature embedded in the MHR Convertible Notes have been bifurcated from the host contract and accounted for separately as a derivative. The bifurcation of the embedded derivative increased the amount of debt discount thereby reducing the book value of the MHR Convertible Notes and increasing prospectively the amount of interest expense to be recognized over the life of the MHR Convertible Notes using the effective yield method.

As consideration for its consent and limitation of rights in connection with the Master Agreement and Amendment by and between the Company and Novartis dated as of June 4, 2010 (the “Novartis Agreement”), the Company granted MHR warrants to purchase 865,000 shares of its common stock (the “June 2010 MHR Warrants”) under the MHR Letter Agreement (as defined below). The Company estimated the fair value of the June 2010 MHR Warrants on the date of grant using Black-Scholes models to be $1.9 million. The Company determined that the resulting modification of the MHR Convertible Notes was substantial in accordance with FASB ASC 470-50, “Modifications and Extinguishments.” As such, the modification of the MHR Convertible Notes was accounted for as an extinguishment and restructuring of the debt, and the warrants issued to MHR were expensed as a financing fee. The fair value of the MHR Convertible Notes as of June 4, 2010 was estimated by calculating the present value of future cash flows discounted at a market rate of return for comparable debt instruments to be $17.2 million. The Company recognized a loss on extinguishment of debt in the amount of $17.0 million which represented the difference between the net carrying amount of the MHR Convertible Notes and their fair value as of the date of the Novartis Agreement and the MHR Letter Agreement.

The book value of the MHR Convertible Notes is comprised of the following:


	September 30,			December 31,
	2011			2010
	(in thousands)
Face Value of the notes (including accrued interest)	$	27,393		$	25,233
Discount (related to the warrant purchase option and embedded conversion feature)		(3,479	)		(5,369	)

	$	23,914		$	19,864

2010 MHR Promissory Notes. In connection with the Novartis Agreement, the Company and MHR entered into a letter agreement (the “MHR Letter Agreement”), and MHR, the Company and Novartis entered into a non-disturbance agreement (the “Non-Disturbance Agreement”), which was a condition to Novartis’ execution of the Novartis Agreement. Pursuant to the MHR Letter Agreement, MHR agreed to limit certain rights and courses of action that it would have available to it as a secured party under the Senior Secured Term Loan Agreement and Pledge and Security Agreement (“Loan and Security Agreement”) between MHR and the Company. MHR also consented to the Novartis Agreement, which consent was required under the Loan and Security Agreement, and MHR also agreed to enter into a comparable agreement at some point in the future in connection with another potential Company transaction (the “Future Transaction Agreement”). The MHR Letter Agreement also provided for the Company to reimburse MHR for its legal fees incurred in connection with the Non-Disturbance Agreement for up to $500,000 and up to $100,000 in legal expenses incurred by MHR in connection with the Future Transaction Agreement. The reimbursements were to be paid in the form of non-interest bearing promissory notes issued on the effective date of the MHR Letter Agreement. As such, the Company issued to MHR non-interest promissory notes for $500,000 and $100,000 on June 8, 2010 (collectively, the “2010 MHR Promissory Notes”). The Company received documentation that MHR expended more than the $500,000 of legal fees in connection with the Non-Disturbance Agreement and $100,000 of legal fees in connection with the Future Transaction Agreement, and, consequently, recorded the issuance of the 2010 MHR Promissory Notes and a corresponding charge to financing expenses. The 2010 MHR Promissory Notes are due June 4, 2012. The Company imputed interest at its incremental borrowing rate of 10%, and discounted the face amounts of the 2010 MHR Promissory Notes. As of September 30, 2011, the unamortized discount of the $500,000 and $100,000 promissory notes are $33,000 and $7,000, respectively.