Quarterly report pursuant to Section 13 or 15(d)

Net Loss Per Common Share - Reconciliation of Numerator and Denominator (Detail)

v2.4.0.8
Net Loss Per Common Share - Reconciliation of Numerator and Denominator (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Numerator:    
Net loss $ (7,109) $ (9,214)
Less: noncash income from change in fair value of common stock warrants 1,757  
Net loss-diluted $ (8,866) $ (9,214)
Denominator:    
Weighted average common shares outstanding 59,303 56,486
Dilutive effect of warrants 1,997  
Weighted-average common shares outstanding and potential dilutive common shares - diluted 61,300 56,486
Net loss per share    
Basic $ (0.12) $ (0.16)
Diluted $ (0.14) $ (0.16)