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Assets and Liability Measured at Fair Value on Recurring Basis (Detail) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
Liabilities:        
Warrant derivative liability $ 47,193,000 $ 69,431,000 $ 90,963,000 $ 123,125,000
Long-term debt redemption feature   14,600,000    
Fair Value, Measurements, Recurring
        
Asset:        
Cash equivalents-money markets 113,500,000 64,100,000    
Liabilities:        
Warrant derivative liability 39,600,000 54,900,000    
Long-term debt redemption feature 7,200,000 14,600,000    
Foreign currency contracts 400,000      
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
        
Asset:        
Cash equivalents-money markets 113,500,000 64,100,000    
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
        
Liabilities:        
Warrant derivative liability 39,600,000 54,900,000    
Long-term debt redemption feature 7,200,000 14,600,000    
Foreign currency contracts $ 400,000