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Change in Fair Value of Warrant Derivative Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
 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, 2009
Warrant
Dec. 31, 2009
Financing Warrant
Dec. 31, 2011
Warrant Issued to Employees
Dec. 31, 2010
Warrant Issued to Employees
Dec. 31, 2009
Warrant Issued to Employees
Dec. 31, 2011
Warrants Issued October 2009
Dec. 31, 2010
Warrants Issued October 2009
Dec. 31, 2009
Warrants Issued October 2009
Oct. 31, 2009
Warrants Issued October 2009
Dec. 31, 2009
Warrants Issued October 2009
Financing Warrant
Dec. 31, 2011
Warrants Issued October 2009
Warrant Issued to Employees
Dec. 31, 2010
Warrants Issued October 2009
Warrant Issued to Employees
Dec. 31, 2009
Warrants Issued October 2009
Warrant Issued to Employees
Dec. 31, 2009
Warrants Issued June and July 2009
Oct. 31, 2009
Warrants Issued June and July 2009
Jul. 31, 2009
Warrants Issued June and July 2009
Dec. 31, 2009
Warrants Issued June and July 2009
Warrant
Dec. 31, 2009
Participation Rights Issued May 2008
Mar. 31, 2008
Participation Rights Issued May 2008
Dec. 31, 2009
Warrants Issued December 2007
Dec. 06, 2009
Warrants Issued December 2007
Dec. 31, 2007
Warrants Issued December 2007
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                                                    
Beginning Balance $ 230,069 $ 41,520 $ 1,037 $ 2,800           $ 230,069 $ 41,520   $ 48,300           $ 4,300 $ 2,800   $ 504 $ 8,200 $ 533 $ 1,000 $ 2,500
Initial fair value of the warrant derivative liability     (47,105)   2,803 47,105     1,210         47,105     1,210       2,803          
(Gain) loss on change in fair value of derivative liability 22,669 205,153 (5,137)             22,669 205,153 (6,625)           1,513       (504)   479    
Compensation (income) expense (9,294) (5,207) (2,859)       (96) 5,713 (170) 100 (5,713)       (96) 5,713 (170)                  
Transfers to equity (129,517) (22,317) (5,328)             (129,517) (22,317)             (4,316)           (1,012)    
Ending Balance $ 123,125 $ 230,069 $ 41,520 $ 2,800           $ 123,125 $ 230,069 $ 41,520 $ 48,300           $ 4,300 $ 2,800     $ 8,200   $ 1,000 $ 2,500