Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2012

Fair Value Measurements [Abstract]

Assets and liabilities measured at fair value on a recurring basis

	Fair Value Measurement as of September 30, 2012
	Total		Level 1		Level 2		Level 3
	(in thousands)
Cash and Cash equivalents	$	37,987	$	37,987	$	—	$	—
Total assets	$	37,987	$	37,987	$	—	$	—
	Fair Value Measurement as of September 30, 2012
	Total		Level 1		Level 2		Level 3
	(in thousands)
Warrants*	$	45,209	$	—	$	—	$	45,209
Total liabilities	$	45,209	$	—	$	—	$	45,209
	Fair Value Measurement as of December 31, 2011
	Total		Level 1		Level 2		Level 3
	(in thousands)
Cash and Cash equivalents	$	39,904	$	39,904	$	—	$	—
Total assets	$	39,904	$	39,904	$	—	$	—
	Fair Value Measurement as of December 31, 2011
	Total		Level 1		Level 2		Level 3
	(in thousands)
Warrants*	$	5,446	$	—	$	—	$	5,446
Total liabilities	$	5,446	$	—	$	—	$	5,446

* See Note 5 —“Warrants” for additional information related to the determination of fair value of the warrants and a reconciliation of changes in fair value.