Quarterly Financial Data (unaudited) (Tables)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Data (unaudited) [Abstract]

Schedule of quarterly financial information

Summarized quarterly financial data for 2012 and 2011 is as follows (in thousands, except per share data):

	Quarters Ended
	March 31			June 30			September 30			December 31
	(In thousands, except per share data)
2012
Total revenues	$	—		$	—		$	—		$	100
Net income (loss)		(10,135	)		(13,262	)		1,584			3,849
Net income (loss) applicable to common stockholders	$	(10,135	)	$	(13,262	)	$	1,584		$	3,849
Basic and diluted income (loss) per share applicable to common stock	$	(0.49	)	$	(0.63	)	$	0.07		$	0.14
2011
Total revenues	$	—		$	150		$	—		$	100
Net loss		(6,275	)		(3,120	)		(558	)		(4,472	)
Net loss applicable to common stockholders	$	(6,275	)	$	(3,120	)	$	(558	)	$	(4,472	)
Basic and diluted loss per share applicable to common stock	$	(0.42	)	$	(0.20	)	$	(0.03	)	$	(0.21	)