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Reconciliation of Numerator and Denominator Used in Computation of Basic and Diluted Net Income Loss per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Numerator for Basic and Diluted:    
Net loss used for basic calculation $ (16,863) $ (9,460)
Effect of revaluation of warrant liability   (6,296)
Adjusted net loss used for diluted calculation $ (16,863) $ (15,756)
Denominator:    
Basic weighted average number of shares outstanding 99,471 93,411
Effect of dilutive potential shares   1,251
Diluted weighted average number of shares outstanding 99,471 94,662
Net loss per share:    
Basic $ (0.17) $ (0.10)
Diluted $ (0.17) $ (0.17)