Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Data - Schedule of Quarterly Financial Information (Detail)

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Quarterly Financial Data - Schedule of Quarterly Financial Information (Detail) (USD $)
In Thousands, except Per Share data, 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
Dec. 31, 2011
Dec. 31, 2010
Revenue $ 2,021 $ 1,797 $ 1,797 $ 252 $ 62          $ 5,867 $ 62   
Net income (loss) $ 28,388 $ (991) $ 17,001 $ (115,533) $ (5,275) $ (4,125) $ (7,923) $ (8,330) $ (71,135) $ (25,653) $ (18,682)
Basic $ 0.50 $ (0.02) $ 0.31 $ (2.30) $ (0.11) $ (0.08) $ (0.16) $ (0.23) $ (1.31) $ (0.56) $ (0.56)
Diluted $ (0.10) $ (0.06) $ (0.04) $ (2.30) $ (0.11) $ (0.08) $ (0.16) $ (0.23) $ (1.31) $ (0.56) $ (0.56)