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Significant Accounting Policies - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Sep. 28, 2012
Dec. 31, 2011
Sep. 30, 2012
Scenario 4
Sep. 28, 2012
Scenario 4
Sep. 30, 2012
Warrants Issued October 2009
Sep. 30, 2011
Warrants Issued October 2009
Sep. 30, 2012
Warrants Issued October 2009
Sep. 30, 2011
Warrants Issued October 2009
Jun. 30, 2012
Warrants Issued October 2009
Dec. 31, 2011
Warrants Issued October 2009
Y
Jun. 30, 2011
Warrants Issued October 2009
Dec. 31, 2010
Warrants Issued October 2009
Sep. 30, 2012
Maximum
Significant Accounting Policies [Line Items]                                  
Short term highly liquid instruments, maturity date                                 90 days
Inventory $ 8,989,000   $ 8,989,000                            
Fair value of derivative liability 90,963,000   90,963,000     123,125,000     90,963,000 155,018,000 90,963,000 155,018,000 120,214,000 123,125,000 285,984,000 230,069,000  
Warrant derivative liability valuation assumptions, risk-free rate                           0.36%      
Warrant derivative liability valuation assumptions, remaining term                           2.8      
Warrant derivative liability valuation assumptions, volatility rate                           118.00%      
Warrant derivative liability fair value assumptions, risk-free rate     0.23%                            
Warrant derivative liability fair value assumptions, remaining term     2 years                            
Warrant derivative liability fair value assumptions, volatility rate     97.00%                            
Increase (Decrease) in the fair value of warrant derivative liability                     32,200,000            
Transfers to equity                 11,603,000 21,000,000 103,885,000 129,458,000          
Loss (Gain) on change in fair value of derivative liability 16,454,000 106,614,000 (68,686,000) (53,403,000)         (16,454,000) (106,614,000) 68,686,000 53,403,000          
Compensation expense for change in fair value of warrants issued to former employees     (13,344,000) (6,022,000)         (1,194,000)   3,037,000            
Hypothetical increase in the market price             10.00%                    
Market price of stock         $ 12.58     $ 13.84                  
Increase (decrease) in the fair value of the warrant derivative liability             $ 10,100,000