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Change in Fair Value of Warrant Derivative Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Derivative [Line Items]        
Beginning Balance     $ 123,125  
Loss (Gain) on change in fair value of derivative liability (18,930) (185,359) (85,139) (160,017)
Compensation expense for change in fair value of warrants issued to former employees     (8,709) (3,360)
Ending Balance 120,214   120,214  
Warrant
        
Derivative [Line Items]        
Compensation expense for change in fair value of warrants issued to former employees     (4,232) (4,356)
Warrants Issued October 2009
        
Derivative [Line Items]        
Beginning Balance 191,387 174,819 123,125 230,069
Loss (Gain) on change in fair value of derivative liability 18,930 185,359 85,139 160,017
Compensation expense for change in fair value of warrants issued to former employees 1,858   4,232  
Transfers to equity (91,961) (79,229) (92,282) (108,458)
Ending Balance 120,214 285,984 120,214 285,984
Warrants Issued October 2009 | Warrant
        
Derivative [Line Items]        
Compensation expense for change in fair value of warrants issued to former employees   $ 5,035   $ 4,356