XML 36 R27.htm IDEA: XBRL DOCUMENT v3.4.0.3
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
Mar. 31, 2016
Mar. 31, 2015
Earnings Per Share [Abstract]    
Net loss $ (29,771) $ (31,126)
Preferred stock purchase option (see Note 8)   (868)
Net loss applicable to common shareholders-basic (29,771) (31,994)
Gain on warrant derivative liability   (119)
Net loss-diluted $ (29,771) $ (32,113)
Net loss per share-basic $ (0.16) $ (0.18)
Weighted average shares outstanding-basic 184,052 175,582
Weighted average shares outstanding-diluted 184,052 175,582
Net loss per share-diluted $ (0.16) $ (0.18)