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
Mar. 31, 2013
Mar. 31, 2012
Employee Stock Purchase Plan (ESPP) [Member]
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Shares issuable 48 42
Warrants [Member]
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Shares issuable 11,573 13,648
Stock options [Member]
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Shares issuable 6,481 3,828