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Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2023
Dec. 31, 2022
Revenues:                        
Collaboration revenue $ 11,250 $ 7,497 $ 26,107 $ 40,744 $ 6,216 $ 7,269 $ 33,604 $ 13,485 $ 44,854 $ 54,229 $ 59,570 $ 64,448
Product revenue 1,468     0         1,468 0 4,335 0
Total revenues 12,718 7,497 26,107 40,744 6,216 7,269 33,604 13,485 46,322 54,229 63,905 64,448
Operating expenses:                        
Cost of product revenue 387     0         387 0 1,523 0
Research and development 17,389 17,556 18,869 20,283 16,630 20,381 36,425 37,011 53,814 57,294 68,532 77,405
Selling, general and administrative 4,432 4,039 4,457 6,270 5,339 5,342 8,496 10,681 12,928 16,951 18,333 20,546
Total operating expenses 22,208 21,595 23,326 26,553 21,969 25,723 44,921 47,692 67,129 74,245 88,388 97,951
Loss from operations (9,490) (14,098) 2,781 14,191 (15,753) (18,454) (11,317) (34,207) (20,807) (20,016) (24,483) (33,503)
Other income, net:                        
Interest income, net 613 623 232 55 (6) (20) 855 (26) 1,468 29 1,995 191
Total other income, net 613 623 232 55 (6) (20) 855 (26) 1,468 29 1,995 191
Loss before income tax expense (8,877) (13,475)   14,246 (15,759)   (10,462) (34,233) (19,339) (19,987) (22,488) (33,312)
Income tax expense (230) (149)   0 0   (149) 0 (379) 0 (443) (272)
Net loss and comprehensive loss (9,107) (13,624) 3,013 14,246 (15,759) (18,474) (10,611) (34,233) (19,718) (19,987) (22,931) (33,584)
Net loss and comprehensive loss $ (9,107) $ (13,624) $ 3,013 $ 14,246 $ (15,759) $ (18,474) $ (10,611) $ (34,233) $ (19,718) $ (19,987) $ (22,931) $ (33,584)
Basic net loss per common share (USD per share) $ (0.10) $ (0.15) $ 0.03 $ 0.16 $ (0.23) $ (0.27) $ (0.13) $ (0.50) $ (0.23) $ (0.29) $ (0.26) $ (0.48)
Diluted net loss per common share (USD per share) $ (0.10) $ (0.15) $ 0.03 $ 0.16 $ (0.23) $ (0.27) $ (0.13) $ (0.50) $ (0.23) $ (0.29) $ (0.26) $ (0.48)
Shares used to compute basic net loss per common share (in shares) 90,287,441 90,115,859 78,640,086 70,217,985 69,133,700 68,138,116 84,409,667 68,638,651 86,390,446 69,170,865 87,427,439 69,857,698
Shares used to compute diluted net loss per common share (in shares) 90,287,441 90,115,859 101,189,396 88,592,568 69,133,700 68,138,116 84,409,667 68,638,651 86,390,446 69,170,865 87,427,439 69,857,698