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Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Income Statement [Abstract]        
Revenue
Operating expenses:        
Research and development, net of reimbursements 3,508 4,010 7,659 8,345
General and administrative 1,154 1,076 2,686 2,440
Total operating expenses 4,662 5,086 10,345 10,785
Loss from operations (4,662) (5,086) (10,345) (10,785)
Other income:        
Interest income - net 37 59 50 88
Total other income 37 59 50 88
Net loss (4,625) (5,027) (10,295) (10,697)
Deemed dividend for warrant down-round protection provision (1) (1) (1) (1)
Net loss applicable to common stockholders $ (4,626) $ (5,028) $ (10,296) $ (10,698)
Net loss per share of common stock - basic and diluted $ (0.41) $ (1.00) $ (1.20) $ (2.39)
Weighted average shares of common stock outstanding, including outstanding pre-funded warrants- basic and diluted 11,379,345 5,051,471 8,559,385 4,476,215