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Liability Measured at Fair Value on a Recurring Basis (Detail) (Fair Value, Measurements, Recurring, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Asset:    
Cash equivalents $ 39  
Liability:    
Warrant derivative liability 123,125 230,069
Fair Value, Inputs, Level 1
   
Asset:    
Cash equivalents 39  
Fair Value, Inputs, Level 3
   
Liability:    
Warrant derivative liability $ 123,125 $ 230,069