Quarterly Data (Schedule Of Quarterly Data) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Quarterly Data [Abstract]
Total revenue	$ 3,710	$ 2,581	$ 1,984	$ 1,290	$ 960	$ 988	$ 987	$ 1,093	$ 9,565	$ 4,028	$ 2,960
Gross profit	405	(2,003)	976	874	(715)	567	606	897	252	1,355
Income tax benefit	(7,733)	(6,245)	(5,400)	(7,410)	(9)				(26,788)	(9)	(2,071)
Net loss	$ (30,856)	$ (27,392)	$ (30,249)	$ (13,530)	$ (451)	$ (59,352)	$ (5,010)	$ (8,296)	$ (102,027)	$ (73,109)	$ (90,853)
Net loss per common share, Basic and diluted	$ (0.44)	$ (0.39)	$ (0.43)	$ (0.19)	$ (0.01)	$ (0.89)	$ (0.07)	$ (0.13)	$ (1.46)	$ (1.08)	$ (1.51)
Weighted Average Number Of Basic And Diluted Shares Outstanding	70,235	70,122	70,075	69,995	69,399	67,047	66,906	66,359	70,117	67,435	59,997
Weighted-average shares, Basic and diluted	70,235	70,122	70,075	69,995	69,399	67,047	66,906	66,359	70,117	67,435	59,997