Quarterly report pursuant to Section 13 or 15(d)

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

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Net Loss Per Common Share - Warrants, Options and Purchase Rights Excluded from Computation of Diluted Net Loss Per Share (Detail) - shares
shares in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Warrants        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Shares issuable 12,136 649 12,136  
Stock Options        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Shares issuable 10,287 8,173 10,287 8,173
2004 Purchase Plan        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Shares issuable 40 33 40 33