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Condensed Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Operating expenses:        
Research and development (includes related party amounts of $39, $19, $54 and $35, respectively) $ 4,327 $ 1,471 $ 6,523 $ 2,677
General and administrative (includes related party amounts of $6, $8, $11 and $15, respectively) 1,447 154 2,031 306
Total operating expenses 5,774 1,625 8,554 2,983
Loss from operations (5,774) (1,625) (8,554) (2,983)
Other expense:        
Interest income (expense) 2 (37) 2 (75)
Change in fair value of convertible promissory notes   (540)   (580)
Other expense (3)   (4)  
Total other expense (1) (577) (2) (655)
Net loss and comprehensive loss $ (5,775) $ (2,202) $ (8,556) $ (3,638)
Net loss per share, basic and diluted $ (23.80) $ (9.12) $ (35.29) $ (15.07)
Weighted-average shares of common stock outstanding, basic and diluted 243,076 241,467 243,076 241,467