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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 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Earnings Loss Per Share [Line Items]                      
Net loss $ (21,891) $ (32,321) $ (62,853) $ (31,994) $ (19,657) $ (26,050) $ 15,323 $ (25,980) $ (115,204) $ (56,364) $ (166,227)
Preferred stock purchase option (see Note 10)                 (868)    
Preferred stock beneficial conversion features (see Note 10)                 (32,987)    
Net loss applicable to common shareholders-basic                 (149,059) (56,364) (166,227)
Gain on warrant derivative liability                   (6,775) (47,936)
Net loss-diluted                 $ (149,059) $ (63,139) $ (214,163)
Net loss per share-basic $ (0.12) $ (0.18) $ (0.35) $ (0.18) $ (0.11) $ (0.15) $ 0.09 $ (0.15) $ (0.83) $ (0.32) $ (1.03)
Weighted average shares outstanding-basic                 180,654 173,719 161,022
Effect of dilutive warrants                   105 6,048
Weighted average shares outstanding-diluted                 180,654 173,824 167,070
Net loss per share-diluted $ (0.12) $ (0.18) $ (0.35) $ (0.18) $ (0.11) $ (0.17) $ 0.08 $ (0.15) $ (0.83) $ (0.36) $ (1.28)