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Reconciliation of Numerator and Denominator Used in Computation of Basic and Diluted Net Income Loss per Common Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Numerator:        
Net loss used for basic calculation $ (6,724) $ (1,907) $ (16,976) $ (10,741)
Effect of revaluation of warrant liability (686) (3,674) 0 0
Adjusted net loss used for diluted calculation $ (7,410) $ (5,581) $ (16,976) $ (10,741)
Denominator        
Basic weighted average number of common shares outstanding 69,727 54,418 64,756 53,753
Effect of dilutive potential common shares resulting from warrants 2,201 818 0 0
Diluted weighted average number of common shares outstanding 71,928 55,236 64,756 53,753
Net loss per common share:        
Basic $ (0.10) $ (0.04) $ (0.26) $ (0.20)
Diluted $ (0.10) $ (0.10) $ (0.26) $ (0.20)