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STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Costs and expenses:        
Research and development $ 440 $ 1,154 $ 1,102 $ 2,874
General and administrative 1,068 1,002 2,187 2,055
Total costs and expenses 1,508 2,156 3,289 4,929
Loss from operations (1,508) (2,156) (3,289) (4,929)
Interest and other income 48 43 86 84
Interest expense (3) (3) (6) (6)
Loss before income taxes (1,463) (2,116) (3,209) (4,851)
Income tax benefit 27   109  
Net loss (1,436) (2,116) (3,100) (4,851)
Change in unrealized loss on marketable securities       2
Comprehensive loss $ (1,436) $ (2,116) $ (3,100) $ (4,849)
Net loss per share:        
Basic and diluted $ (1.14) $ (2.74) $ (2.87) $ (6.34)
Weighted average shares outstanding:        
Basic and diluted 1,263,768 773,528 1,080,885 765,164