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Significant Accounting Policies - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Mar. 28, 2013
Dec. 31, 2011
Significant Accounting Policies [Line Items]          
Sales discount percentage 2.00%        
Sales discount term 30 days        
Warrant derivative liability $ 65,359,000 $ 191,387,000 $ 69,430,000   $ 123,125,000
Warrant derivative liability fair value assumptions, risk-free rate 0.20%   0.25%    
Derivative liability fair value assumptions, term 1 year 6 months   1 year 9 months 18 days    
Warrant derivative liability fair value assumptions, volatility rate 94.00%   95.00%    
Gain (loss) on change in fair value of derivative liabilities 3,620,000 (66,209,000)      
Compensation income for change in fair value of warrants issued to former employees 4,874,000 3,874,000      
Market price of common stock       $ 7.41  
Hypothetical increase in market price of common shares 10.00%        
Long term debt redemption feature 14,600,000        
Maximum
          
Significant Accounting Policies [Line Items]          
Short term highly liquid instruments, maturity date 90 days        
Embedded Derivative Financial Instruments
          
Significant Accounting Policies [Line Items]          
Warrant derivative liability 15,600,000   14,576,000    
Gain (loss) on change in fair value of derivative liabilities 1,000,000        
Change of control obligation     140,000,000    
Maximum repayment of future revenue and receivables     150,000,000    
Long term debt redemption feature 15,600,000   14,600,000    
Embedded Derivative Financial Instruments | Maximum
          
Significant Accounting Policies [Line Items]          
Derivative liability fair value assumptions, term 7 years 4 months 24 days   8 years    
Derivative liability fair value assumption, coupon rate 11.90%   11.50%    
Derivative liability fair value assumptions, market yields 25.60%   27.70%    
Embedded Derivative Financial Instruments | Minimum
          
Significant Accounting Policies [Line Items]          
Derivative liability fair value assumptions, term 4 years   4 years 9 months 18 days    
Derivative liability fair value assumption, coupon rate 9.90%   3.00%    
Derivative liability fair value assumptions, market yields 12.30%   10.70%    
Foreign Exchange Forward
          
Significant Accounting Policies [Line Items]          
Notional amounts, foreign exchange forward contracts 15,000,000        
Net fair value, foreign exchange forward contracts 700,000        
Foreign Exchange Forward | Other Current Liabilities
          
Significant Accounting Policies [Line Items]          
Gain (loss) on change in fair value of derivative liabilities 700,000        
Effect of a hypothetical 10% increase in the market price of common shares
          
Significant Accounting Policies [Line Items]          
Increase (Decrease) in the fair value of warrant derivative liability 5,900,000        
Market price of common stock       $ 8.15  
Warrant
          
Significant Accounting Policies [Line Items]          
Warrant derivative liability 49,011,000   54,854,000    
Warrants Issued October 2009
          
Significant Accounting Policies [Line Items]          
Increase (Decrease) in the fair value of warrant derivative liability (5,900,000)        
Gain (loss) on change in fair value of derivative liabilities 5,400,000        
Compensation income for change in fair value of warrants issued to former employees $ 500,000