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STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - 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 $ 15,517 $ 7,723 $ 27,214 $ 14,977
General and administrative 5,540 3,400 10,396 5,325
Total operating expenses 21,057 11,123 37,610 20,302
Loss from operations (21,057) (11,123) (37,610) (20,302)
Other income:        
Interest income, net 33 25 77 266
Other income 15 74 15 140
Total other income 48 99 92 406
Net loss (21,009) (11,024) (37,518) (19,896)
Other comprehensive gain (loss):        
Unrealized (loss) gain on available-for-sale securities (14)   34  
Comprehensive loss $ (21,023) $ (11,024) $ (37,484) $ (19,896)
Net loss per share, basic and diluted $ (0.57) $ (0.51) $ (1.02) $ (1.68)
Weighted-average shares outstanding, basic and diluted 36,701,836 21,627,361 36,690,824 11,808,103