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)

v3.7.0.1
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, 2016
Dec. 31, 2015
Dec. 31, 2014
Warrants      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Shares issuable 8,300 8,300  
Stock Options      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Shares issuable 10,942 6,750 8,169
ESPP      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Shares issuable 31 34 67