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Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Jul. 31, 2009
Dec. 31, 2008
Dec. 31, 2011
Warrants Issued October 2009
Year
Dec. 31, 2010
Warrants Issued October 2009
Year
Dec. 31, 2009
Warrants Issued October 2009
Oct. 31, 2009
Warrants Issued October 2009
Year
Dec. 31, 2009
Warrants Issued June and July 2009
Year
Oct. 31, 2009
Warrants Issued June and July 2009
Jul. 31, 2009
Warrants Issued June and July 2009
Year
Dec. 31, 2009
Warrants Issued December 2007
Year
Dec. 06, 2009
Warrants Issued December 2007
Dec. 31, 2008
Warrants Issued December 2007
Dec. 31, 2007
Warrants Issued December 2007
Year
Dec. 31, 2009
Participation Rights Issued May 2008
Dec. 31, 2008
Participation Rights Issued May 2008
Year
Mar. 31, 2008
Participation Rights Issued May 2008
Year
Significant Accounting Policies [Line Items]                                      
Fair value of derivative liability $ 123,125,000 $ 230,069,000 $ 41,520,000 $ 2,800,000 $ 1,037,000 $ 123,125,000 $ 230,069,000 $ 41,520,000 $ 48,300,000   $ 4,300,000 $ 2,800,000   $ 1,000,000 $ 533,000 $ 2,500,000   $ 504,000 $ 8,200,000
Warrant derivative liability valuation assumptions, risk-free rate           0.36% 1.52%   2.37% 2.55%   2.35% 1.32%     3.32%   0.04% 2.24%
Warrant derivative liability valuation assumptions, remaining term           2.8 3.8   5.0 4.8   5.0 3.0     5.0   0.2 0.6
Warrant derivative liability valuation assumptions, volatility rate           118.00% 117.00%   119.00% 112.00%     131.00%     113.00%   131.00% 90.00%
Decrease in the fair value of the warrant derivative liability           22,600,000 210,900,000                        
Fair value of derivative liability transferred to equity 129,517,000 22,317,000 5,328,000     129,517,000 22,317,000     4,316,000     1,012,000            
(Gain) loss on change in fair value of derivative liability (22,669,000) (205,153,000) 5,137,000     (22,669,000) (205,153,000) 6,625,000   (1,513,000)     (479,000)       504,000    
Compensation (income) expense for change in fair value of warrants issued to former employees $ 9,294,000 $ 5,207,000 $ 2,859,000     $ (100,000) $ 5,713,000