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Statements of Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Revenue        
Collaborations, milestones, and royalties $ 45,523 $ 30,175 $ 64,485 $ 115,670
Operating expenses        
Research and development 60,060 47,084 124,439 94,839
General and administrative 11,460 11,091 25,408 22,364
Total operating expenses 71,520 58,175 149,847 117,203
Loss from operations (25,997) (28,000) (85,362) (1,533)
Other income (expenses)        
Interest income, net 3,764 717 6,656 1,371
Other expense, net (9) (147) (1,401) (244)
Gain (loss) on equity securities, net 288 (6,545) (2,610) (9,974)
Total other income (expense), net 4,043 (5,975) 2,645 (8,847)
Net loss (21,954) (33,975) (82,717) (10,380)
Other comprehensive income (loss)        
Net unrealized gain (loss) on marketable debt securities 1,765 (1,823) 5,093 (7,435)
Comprehensive loss $ (20,189) $ (35,798) $ (77,624) $ (17,815)
Basic net loss per common share (in dollars per share) $ (0.37) $ (0.57) $ (1.38) $ (0.17)
Diluted net loss per common share (in dollars per share) $ (0.37) $ (0.57) $ (1.38) $ (0.17)
Weighted average shares used to compute net income (loss) per share attributable to common stockholders:        
Basic weighted average common shares outstanding (in shares) 59,807,558 59,567,139 59,922,784 59,487,924
Diluted weighted average common shares outstanding (in shares) 59,807,558 59,567,139 59,922,784 59,487,924