Fair Value of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2012

Assets and Liabilities Measured at Fair Value on Recurring Basis

The following table presents information about the Company’s assets and liabilities as of September 30, 2012 and December 31, 2011 that are measured at fair value on a recurring basis and indicates the fair value hierarchy of the valuation techniques the Company utilized to determine such fair value:

	September 30, 2012
In thousands	Total		Level 1		Level 2		Level 3
Marketable securities	$	65,041	$	—	$	65,041	$	—
	December 31, 2011
In thousands	Total		Level 1		Level 2		Level 3
Warrant liability	$	58,639	$	—	$	58,639	$	—

Changes in Fair Value of Warrant Liability

The changes in the fair value of the warrant liability for the three and nine-month periods ended September 30, 2012 and 2011 were as follows:

	Three Months Ended September 30,					Nine Months Ended September 30,
In thousands	2012		2011			2012			2011
Balance, beginning of period	$	—	$	55,427		$	58,639		$	28,815
Revaluation of warrants		—		(14,846	)		15,924			26,629
Exercise of warrants		—		(2,028	)		(74,563	)		(16,891	)
Balance, end of period	$	—	$	38,553		$	—		$	38,553