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Net Loss and the Number of Shares Used to Compute Basic and Diluted 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
Earnings Loss Per Share [Line Items]        
Net loss $ (30,675) $ (26,050) $ (93,313) $ (36,707)
Preferred stock purchase option (see Note 8)     (868)  
Preferred stock beneficial conversion features (see Note 8) (1,646)   (32,987)  
Net loss applicable to common shareholders-basic (32,321) (26,050) (127,168) (36,707)
Gain on warrant derivative liability   (4,392) (119) (6,773)
Net loss-diluted $ (32,321) $ (30,442) $ (127,287) $ (43,480)
Net loss per share-basic $ (0.18) $ (0.15) $ (0.71) $ (0.21)
Weighted average shares outstanding-basic 183,245 174,502 179,780 173,426
Effect of dilutive warrants   639   879
Weighted average shares outstanding-diluted 183,245 175,141 179,780 174,305
Net loss per share-diluted $ (0.18) $ (0.17) $ (0.71) $ (0.25)