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Going Concern - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended 190 Months Ended
Jun. 30, 2012
Mar. 31, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2004
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Dec. 31, 2007
Dec. 31, 2006
Dec. 31, 2005
Jun. 30, 2004
Jun. 30, 2003
Jun. 30, 2002
Jun. 30, 2001
Jun. 30, 2000
Jun. 30, 1999
Jun. 30, 1998
Jun. 30, 1997
Jun. 30, 2012
Going Concern [Line Items]                                            
Net income loss $ (602) $ 2,715 $ (348) $ 2,112 $ 4,321 $ (6,594) $ 4,685 $ (7,824) $ (3,012) $ (13,600) $ (13,357) $ (16,440) $ (13,871) $ (6,872) $ (17,795) $ (3,732) $ (2,524) $ (1,605) $ (958) $ (398) $ (37) $ (101,858)
Unrealized/realized gain on derivatives 645   225 3,971 5,905                                 8,792
Net cash used in operating activities (1,133)   1,772 (1,711) (1,823)                                 (83,754)
Deficit accumulated during development stage $ 103,267     $ 103,267     $ 105,380                             $ 103,267