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Reconciliation of Numerator and Denominator Used in Computation of Basic and Diluted Net Income Loss per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Numerator for Basic and Diluted:    
Net loss used for basic calculation $ (225) $ (10,252)
Effect of revaluation of warrant liability (9,034) 0
Adjusted net loss used for diluted calculation $ (9,259) $ (10,252)
Denominator:    
Basic weighted average number of shares outstanding 72,088 59,730
Effect of dilutive potential shares 3,070 0
Diluted weighted average number of shares outstanding 75,158 59,730
Net loss per share:    
Basic $ 0.00 $ (0.17)
Diluted $ (0.12) $ (0.17)