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Condensed Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 5 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2018
Operating expenses:        
Research and development $ 1,544 $ 1,564 $ 3,067 $ 4,525
General and administrative 830 1,206 1,887 3,510
Total operating expenses 2,374 2,770 4,954 8,035
Loss from operations (2,374) (2,770) (4,954) (8,035)
Other income (expense):        
Interest and other income, net 25 9 9 82
Change in fair value of warrant liability (561) (41) (41) (1,057)
Loss before income tax expense (2,910) (2,802) (4,986) (9,010)
Income tax expense
Net loss (2,910) (2,802) (4,986) (9,010)
Accrued dividends on redeemable convertible preferred stock (300) (303) (343) (900)
Deemed dividends for accretion of redeemable convertible preferred stock issuance costs (429) (388) (439) (1,257)
Net loss attributable to common stockholders $ (3,639) $ (3,493) $ (5,768) $ (11,167)
Net loss per share attributable to common stockholders, basic and diluted $ (0.65) $ (1.00) $ (1.69) $ (2.40)
Weighted-average number of common shares outstanding, basic and diluted 5,615,000 3,500,000 3,411,000 4,658,000