Annual report pursuant to Section 13 and 15(d)

Net Income (Loss) Per Common Share - Warrants, Options and Purchase Rights Excluded from Computation of Diluted Net Income (Loss) Per Share (Detail)

v3.3.1.900
Net Income (Loss) Per Common Share - Warrants, Options and Purchase Rights Excluded from Computation of Diluted Net Income (Loss) Per Share (Detail) - shares
shares in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Warrants      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Shares issuable 8,300   8,282
Stock Options      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Shares issuable 6,750 8,169 6,527
ESPP      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Shares issuable 34 67 64