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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Revenues    
Collaborative revenues $ 417 $ 450
Operating expenses    
Research and development (includes stock-based compensation of $254 and $139, respectively) 4,430 5,021
General and administrative (includes stock-based compensation of $328 and $274, respectively) 2,151 1,660
Total operating expenses 6,581 6,681
Loss from operations (6,164) (6,231)
Interest income, net 41 13
Net loss $ (6,123) $ (6,218)
Net loss per common share, basic and diluted $ (0.08) $ (0.12)
Weighted average common shares outstanding, basic and diluted 78,748 52,903