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)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Warrants
       
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Shares issuable   9,634   9,634
Stock Options
       
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Shares issuable 8,161 6,570 8,161 6,570
Employee Stock Purchase Plan (ESPP)
       
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Shares issuable 71 85 71 85