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Liability Measured at Fair Value on a Recurring Basis (Detail) (Fair Value, Measurements, Recurring, USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Asset:    
Cash equivalents $ 37 $ 39
Liability:    
Warrant derivative liability 191,387 123,125
Fair Value, Inputs, Level 1
    
Asset:    
Cash equivalents 37 39
Fair Value, Inputs, Level 3
    
Liability:    
Warrant derivative liability $ 191,387 $ 123,125