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CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Income Statement [Abstract]        
Revenue from Contract with Customer, Product and Service [Extensible List] License [Member] License [Member] License [Member] License [Member]
Collaboration revenue $ 200 $ 50 $ 257 $ 50
Operating expenses:        
Research and development 18,205 22,963 34,872 42,150
General and administrative 4,742 4,745 9,793 9,724
Expense from operations 22,947 27,708 44,665 51,874
Loss from operations (22,747) (27,658) (44,408) (51,824)
Other income (expense) 1,401 287 2,338 (75)
Net loss (21,346) (27,371) (42,070) (51,899)
Unrealized gain (loss) on investments 265 (581) 803 (548)
Comprehensive loss $ (21,081) $ (27,952) $ (41,267) $ (52,447)
Net loss per share – basic (in dollars per share) $ (0.50) $ (0.65) $ (0.99) $ (1.22)
Net loss per share – diluted (in dollars per share) $ (0.50) $ (0.65) $ (0.99) $ (1.22)
Weighted-average shares outstanding – basic (in shares) 42,467,664 42,380,454 42,453,513 42,369,102
Weighted-average shares outstanding – diluted (in shares) 42,467,664 42,380,454 42,453,513 42,369,102