Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Employee Stock Purchase Plan [Member]
     
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Shares issuable 79 70 61
Warrants [Member]
     
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Shares issuable 11,583 16,643 10,918
Stock options [Member]
     
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Shares issuable 5,099 3,672 2,746