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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, 2016
Sep. 30, 2015
Jun. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Earnings Per Share [Abstract]          
Net loss $ (15,772) $ (30,675)   $ (58,897) $ (93,313)
Preferred stock purchase option (see Note 8)         (868)
Preferred stock beneficial conversion features (see Note 8)   (1,646) $ (31,300)   (32,987)
Net loss applicable to common shareholders-basic (15,772) (32,321)   (58,897) (127,168)
Gain on warrant derivative liability         (119)
Net loss-diluted $ (15,772) $ (32,321)   $ (58,897) $ (127,287)
Net loss per share-basic and diluted $ (0.08) $ (0.18)   $ (0.31) $ (0.71)
Weighted average shares outstanding-basic and diluted 209,149 183,245   192,618 179,780