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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Operating expenses:    
Research and development $ 3,772 $ 4,377
General and administrative 1,174 2,437
Total operating expenses 4,946 6,814
Total operating loss (4,946) (6,814)
Other income (expense):    
Interest income 9 14
Total other income (expense) 9 14
Net loss (4,937) (6,800)
Preferred stock dividends (272) (153)
Preferred stock accretion   (57)
Net loss applicable to common stockholders $ (5,209) $ (7,010)
Net loss per common share - basic and diluted $ (0.15) $ (0.24)
Weighted average common shares outstanding - basic and diluted 33,928 28,827