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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 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Numerator for Basic and Diluted:        
Net loss used for basic calculation $ (15,680) $ (10,759) $ (41,112) $ (18,573)
Effect of revaluation of warrant liability (1,109) (1,738) (4,698) (14,263)
Adjusted net loss used for diluted calculation $ (16,789) $ (12,497) $ (45,810) $ (32,836)
Denominator:        
Basic weighted average number of shares outstanding 96,864 75,194 95,347 73,407
Effect of dilutive potential shares 741 909 993 2,030
Diluted weighted average number of shares outstanding 97,605 76,103 96,340 75,437
Net loss per share:        
Basic $ (0.16) $ (0.14) $ (0.43) $ (0.25)
Diluted $ (0.17) $ (0.16) $ (0.48) $ (0.44)