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Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Operating expenses:        
Research and development $ 15,098 $ 15,362 $ 49,258 $ 68,396
Acquired in-process research and development   1,500   3,000
General and administrative 8,184 10,664 35,295 38,754
Impairment of long-lived assets 5,390   5,390  
Loss from operations (28,672) (27,526) (89,943) (110,150)
Other income (expense), net 1,562 825 4,639 1,096
Net loss $ (27,110) $ (26,701) $ (85,304) $ (109,054)
Per share information:        
Net loss per share of common stock, basic $ (0.49) $ (0.49) $ (1.56) $ (2.01)
Net loss per share of common stock, diluted $ (0.49) $ (0.49) $ (1.56) $ (2.01)
Weighted average common shares outstanding, basic 54,789,410 54,473,945 54,697,967 54,379,397
Weighted average common shares outstanding, diluted 54,789,410 54,473,945 54,697,967 54,379,397
Comprehensive loss:        
Net loss $ (27,110) $ (26,701) $ (85,304) $ (109,054)
Unrealized gain (loss) on marketable securities 148 110 774 (1,055)
Comprehensive loss $ (26,962) $ (26,591) $ (84,530) $ (110,109)