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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
Mar. 31, 2013
Mar. 31, 2012
Numerator for Basic and Diluted    
Net loss $ (10,252) $ (8,834)
Denominator    
Basic weighted average number of common shares outstanding 59,730 53,088
Effect of dilutive potential common shares resulting from convertible preferred stock, stock options, restricted stock units, warrants and employee stock purchase plan rights 0 0
Diluted weighted average number of common shares outstanding 59,730 53,088
Net loss per common share:    
Basic $ (0.17) $ (0.17)
Diluted $ (0.17) $ (0.17)