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Assets and Liability Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Liabilities:      
Derivative liability $ 8,170 $ 7,519 $ 17,994
Long-term debt derivative liabilities 8,170 7,400  
Fair Value, Measurements, Recurring      
Asset:      
Cash equivalents-money markets 14,184 65,156  
Liabilities:      
Long-term debt derivative liabilities 8,170 7,400  
Fair Value, Measurements, Recurring | Warrant      
Liabilities:      
Derivative liability   119  
Fair Value, Measurements, Recurring | Level 1      
Asset:      
Cash equivalents-money markets 14,184 65,156  
Fair Value, Measurements, Recurring | Level 3      
Liabilities:      
Long-term debt derivative liabilities $ 8,170 7,400  
Fair Value, Measurements, Recurring | Level 3 | Warrant      
Liabilities:      
Derivative liability   $ 119