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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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Numerator for Basic and Diluted:        
Net loss used for basic calculation $ (15,972) $ (7,589) $ (25,432) $ (7,814)
Effect of revaluation of warrant liability   (4,007) (3,589) (13,041)
Adjusted net loss used for diluted calculation $ (15,972) $ (11,596) $ (29,021) $ (20,855)
Denominator:        
Basic weighted average number of shares outstanding 95,728 72,899 94,576 72,495
Effect of dilutive potential shares   1,618 1,106 2,432
Diluted weighted average number of shares outstanding 95,728 74,517 95,682 74,927
Net loss per share:        
Basic $ (0.17) $ (0.10) $ (0.27) $ (0.11)
Diluted $ (0.17) $ (0.16) $ (0.30) $ (0.28)