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Summary Of Significant Accounting Policies (Reconciliation Of Numerators And Denominators Of EPS Calculation) (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
Summary Of Significant Accounting Policies [Abstract]                      
Net loss $ (19,772) $ (20,135) $ (15,949) $ (10,275) $ (21,168) $ (26,271) $ (51,709) $ (37,679) $ (66,131) $ (136,827) $ (186,284)
Weighted-average shares of common stock outstanding                 53,537 51,144 47,750
Weighted-average shares subject to repurchase                 (467) (302) (647)
Shares used in per-share calculation basic                 53,070 50,842 47,103
Shares used in per-share calculation diluted                 53,070 50,842 47,103
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)