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Assets and Liability Measured at Fair Value on Recurring Basis (Detail) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Liabilities:        
Warrant derivative liability $ 13,529,000 $ 17,994,000 $ 65,359,000 $ 69,430,000
Long term debt redemption feature       14,600,000
Fair Value, Measurements, Recurring
        
Asset:        
Cash equivalents-money markets 93,500,000 113,500,000    
Liabilities:        
Warrant derivative liability 5,900,000 6,900,000    
Long term debt redemption feature 7,600,000 11,100,000    
Fair Value, Measurements, Recurring | Level 1
        
Asset:        
Cash equivalents-money markets 93,500,000 113,500,000    
Fair Value, Measurements, Recurring | Level 3
        
Liabilities:        
Warrant derivative liability 5,900,000 6,900,000    
Long term debt redemption feature $ 7,600,000 $ 11,100,000