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Condensed Statements of Operations (Unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Revenues:        
Grant revenues $ 12 $ 225 $ 41 $ 278
Operating expenses:        
Research and development expenses 1,183 [1] 1,213 [1] 2,659 [1] 14,985 [1]
General and administrative expenses 850 [1] 977 [1] 1,693 [1] 1,652 [1]
Total operating expenses 2,033 2,190 4,352 16,637
Loss from operations (2,021) (1,965) (4,311) (16,359)
Interest income, net 5 4 11 4
Other income (expense), net 10   10 (3)
Net loss (2,006) (1,961) (4,290) (16,358)
Series A and Series A-1 convertible preferred stock dividends (1,213) (2,399) (2,968) (5,946)
Net loss applicable to common stockholders $ (3,219) $ (4,360) $ (7,258) $ (22,304)
Net loss per common share applicable to common stockholders (Note 1):        
Basic and diluted $ (0.23) $ (0.39) $ (0.54) $ (2.52)
Weighted average common shares: basic and diluted 14,015,451 11,168,144 13,319,634 8,845,026
[1] Non-cash stock-based compensation expenses included in operating expenses are as follows: Research and development $ 206 $ 136 $ 416 $ 561 General and administrative 251 293 532 496