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Assets and Liability Measured at Fair Value on Recurring Basis (Detail) (USD $)
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Liabilities:        
Warrant derivative liability $ 13,913,000 $ 17,994,000 $ 45,515,000 $ 69,431,000
Long-term debt derivative liabilities       14,600,000
Fair Value, Measurements, Recurring
        
Asset:        
Cash equivalents-money markets 73,500,000 113,500,000    
Liabilities:        
Warrant derivative liability 4,500,000 6,900,000    
Long-term debt derivative liabilities 9,400,000 11,100,000    
Fair Value, Measurements, Recurring | Level 1
        
Asset:        
Cash equivalents-money markets 73,500,000 113,500,000    
Fair Value, Measurements, Recurring | Level 3
        
Liabilities:        
Warrant derivative liability 4,500,000 6,900,000    
Long-term debt derivative liabilities $ 9,400,000 $ 11,100,000