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Quarterly Financial Data (Schedule Of Quarterly Financial Data) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Quarterly Financial Data [Abstract]                      
Total revenue $ 20,419 $ 17,417 $ 20,867 $ 28,716 $ 28,627 $ 18,058 $ 20,800 $ 9,058 $ 87,419 $ 76,543 $ 286,603
Operating loss (16,027) (20,616) (14,970) (6,128) (20,418) (26,569) (51,125) (38,327) (57,741) (136,439) (177,983)
Net loss (19,772) (20,135) (15,949) (10,275) (21,168) (26,271) (51,709) (37,679) (66,131) (136,827) (186,284)
Net loss per common share - basic $ (0.35) $ (0.38) $ (0.31) $ (0.20) $ (0.42) $ (0.52) $ (1.02) $ (0.74) $ (1.25) $ (2.69) $ (3.95)
Net loss per common share - diluted $ (0.35) $ (0.38) $ (0.31) $ (0.20) $ (0.42) $ (0.52) $ (1.02) $ (0.74) $ (1.25) $ (2.69) $ (3.95)
Patent costs $ 4,900       $ 4,900         $ 4,917