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Assets and Liability Measured at Fair Value on Recurring Basis (Detail) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Liabilities:      
Warrant derivative liability $ 17,994,000 $ 69,431,000 $ 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 6,900,000 54,900,000  
Long term debt redemption feature 11,100,000 14,600,000  
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 6,900,000 54,900,000  
Long term debt redemption feature $ 11,100,000 $ 14,600,000