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STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Statement [Abstract]        
Revenue from Contract with Customer, Product and Service [Extensible List]     License [Member]  
Collaboration revenue - related party $ 1,900 $ 2,435 $ (61) $ 8,592
Operating expenses:        
Research and development 15,137 11,804 40,356 27,696
General and administrative 4,343 2,470 14,098 5,816
Expense from operations 19,480 14,274 54,454 33,512
Loss from operations (17,580) (11,839) (54,515) (24,920)
Other income (expense):        
Interest income 251 86 1,947 474
Other (81) (76) (253) (145)
Total other income 170 10 1,694 329
Net loss (17,410) (11,829) (52,821) (24,591)
Unrealized loss on short-term investments (207) (28) (1,764) (64)
Comprehensive loss $ (17,617) $ (11,857) $ (54,585) $ (24,655)
Net loss per share – basic (in dollars per share) $ (0.41) $ (1.54) $ (1.26) $ (3.21)
Net loss per share – diluted (in dollars per share) $ (0.41) $ (1.54) $ (1.26) $ (3.21)
Weighted-average shares outstanding – basic (in shares) 42,155,981 7,700,371 41,946,852 7,656,077
Weighted-average shares outstanding – diluted (in shares) 42,155,981 7,700,371 41,946,852 7,656,077