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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Operating expenses:    
Research and development $ 4,377 $ 3,136
General and administrative 2,437 1,704
Total operating expenses 6,814 4,840
Total operating loss (6,814) (4,840)
Other income (expense):    
Interest income 14 14
Total other income (expense) 14 14
Net loss (6,800) (4,826)
Preferred stock dividends (153) (191)
Preferred stock accretion (57) (57)
Net loss applicable to common stockholders $ (7,010) $ (5,074)
Net loss per common share - basic and diluted $ (0.24) $ (0.22)
Weighted average common shares outstanding - basic and diluted 28,827 23,062