Organization and Nature of Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012 item	Dec. 31, 2011	Dec. 31, 2010
Organization and Nature of Operations
Number of proprietary products in clinical development									2
Number of product candidates receiving tentative approval									1
Net (loss) income	$ (13,512)	$ (13,482)	$ (10,013)	$ (9,277)	$ 81,975	$ (9,734)	$ (7,377)	$ (11,049)	$ (46,284)	$ 53,815	$ (38,463)
Gain on the sale of TCD, net of taxes										$ 74,852