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Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 8 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Operating expenses:    
Research and development $ 3,930 $ 5,627
General and administrative 3,220 4,694
Total operating expenses 7,150 10,321
Loss from operations (7,150) (10,321)
Other income (expense):    
Interest and other income, net 35 164
Change in fair value of warrant liability (41) (2,583)
Loss before income tax expense (7,156) (12,740)
Income tax expense
Net loss (7,156) (12,740)
Accrued dividends on redeemable convertible preferred stock (643) (1,048)
Deemed dividends for accretion of redeemable convertible preferred stock issuance costs (840) (1,694)
Deemed dividends for beneficial conversion feature of redeemable convertible preferred stock (21,747)
Net loss attributable to common stockholders $ (8,639) $ (37,229)
Net loss per share attributable to common stockholders, basic and diluted $ (2.50) $ (5.80)
Weighted-average number of common shares outstanding, basic and diluted 3,453 6,418