In September 2009, the Company sold $155.0 million in aggregate of secured notes due 2012 (the "2012 Notes") for an aggregate of $122.2 million pursuant to a note purchase agreement with Olmsted Park S.A. (the "Purchaser"). The 2012 Notes were scheduled to mature on October 31, 2012, subject to earlier mandatory redemption to the extent that specified milestone events set forth in the Company's collaboration with Janssen occurred prior to October 31, 2012. In February 2011, the Company received a milestone payment of $50.0 million and subsequently redeemed $50.0 million of 2012 Notes pursuant to their terms. The remaining $105.0 million of 2012 Notes were redeemed on October 31, 2011, with the proceeds of milestone payments received from Janssen in October 2011. The 2012 Notes contained an embedded derivative related to the potential mandatory redemption or early repayment of the 2012 Notes at the face amount prior to their maturity date. The fair value of this embedded derivative was evaluated quarterly, with changes in the fair value of the embedded derivative resulting in a corresponding loss or gain. The Company recorded quarterly interest expense related to the 2012 Notes using the effective interest rate method.

In September 2009, the Company entered into two purchase agreements with the Purchaser pursuant to which the Company sold its rights to an aggregate of $95.0 million in contingent milestone payments under the Janssen agreement related to the launch of telaprevir in the European Union, for nonrefundable payments totaling $32.8 million. The Purchaser received the $95.0 million in milestone payments from Janssen in the fourth quarter of 2011. The Company determined that this sale of a future revenue stream should be accounted for as a liability. The fair value of the rights sold to the Purchaser pursuant to the purchase agreements was evaluated each reporting period until the payments were received in the fourth quarter of 2011, with changes in the fair value of the derivative instruments based on the probability of achieving the milestones, the timing of achieving the milestones or discount rates resulting in a corresponding gain or loss.

The table below sets forth the total expenses related to the September 2009 financial transactions for the three and six months ended June 30, 2012 and 2011:

	Three Months Ended June 30,					Six Months Ended June 30,

	2012		2011			2012		2011
	(in thousands)
Expenses and Losses (Gains):
Interest expense related to 2012 Notes	$	—	$	2,863		$	—	$	10,797
Change in fair value of embedded derivative related to 2012 Notes		—		(18	)		—		(1,514	)
Change in fair value of free-standing derivatives related to the sale of milestone payments		—		2,238			—		9,332

Total September 2009 financial transaction expenses	$	—	$	5,083		$	—	$	18,615