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Debt - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2009
Dec. 31, 2011
Dec. 31, 2010
Jul. 31, 2009
Dec. 31, 2008
Oct. 31, 2009
Warrants Issued June and July 2009
Jul. 31, 2009
Warrants Issued June and July 2009
Jun. 30, 2009
June 2009 Private Placement
Convertible 8 Percent Bridge Loans, due August 2009
Jun. 30, 2009
June 2009 Private Placement
Warrants Issued June and July 2009
Convertible 8 Percent Bridge Loans, due August 2009
Jun. 30, 2009
June 2009 Private Placement
Warrants Issued June 2009
Jul. 31, 2009
July 2009 Private Placement
Convertible 8 Percent Bridge Loans, due August 2009
Jul. 31, 2009
July 2009 Private Placement
Convertible 8 Percent Bridge Loans, due September 2009
Jul. 31, 2009
July 2009 Private Placement
Warrants Issued June and July 2009
Convertible 8 Percent Bridge Loans, due September 2009
Jul. 31, 2009
July 2009 Private Placement
Warrants Issued June 2009
Convertible 8 Percent Bridge Loans, due August 2009
Jul. 31, 2009
July 2009 Private Placement
Warrants Issued June 2009
Convertible 8 Percent Bridge Loans, due September 2009
Dec. 31, 2009
June and July 2009 Private Placement
Bridge Loan
Oct. 16, 2009
June and July 2009 Private Placement
Bridge Loan
Jul. 31, 2009
June and July 2009 Private Placement
Bridge Loan
Jun. 30, 2009
June and July 2009 Private Placement
Bridge Loan
Oct. 31, 2009
October 2009 Private Placement
Bridge Loan
Oct. 16, 2009
October 2009 Private Placement
Bridge Loan
Debt Disclosure [Line Items]                                          
Convertible bridge loans issued under private placement, face amount               $ 2,600,000       $ 3,000,000         $ 5,500,000 $ 5,600,000      
Loan payable                                   2,800,000 1,900,000    
Accrued interest                                     100,000    
Interest expense                               2,800,000          
Bridge notes converted in conjunction with the private placement, shares of common stock issued                                       3,999,996  
Number of warrants issued                 1,444,442       1,666,663   1,388,887            
Warrants issued, number of shares called by the warrant                                       1,999,996 1,999,996
Exercise price of the warrants   1.48             1       1.00   1.00         1.50 1.50
Repayment of bridge notes 2,000,000                   100,000                    
Number of warrants cancelled                           1,388,887              
Fair value of derivative liability 41,520,000 123,125,000 230,069,000 2,800,000 1,037,000 4,300,000 2,800,000     1,300,000                      
Bridge notes converted in conjunction with the private placement, amount                                       $ 3,600,000