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Consolidated Statements of Operations and Comprehensive Loss - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Income Statement [Abstract]        
Collaboration revenue $ 30,027 $ 0 $ 41,274 $ 15,000
Operating expenses:        
Research and development 25,314 17,948 49,499 38,916
General and administrative 5,246 4,687 10,669 8,972
Total operating expenses 30,560 22,635 60,168 47,888
Loss from operations (533) (22,635) (18,894) (32,888)
Other income, net:        
Interest income 104 1,061 299 2,958
Other income, net 0 26 3 120
Total other income, net 104 1,087 302 3,078
Net loss (429) (21,548) (18,592) (29,810)
Unrealized (loss) income on available for sale securities (65) (392) (172) 415
Comprehensive loss $ (494) $ (21,940) $ (18,764) $ (29,395)
Net loss per common share:        
Basic (in dollars per share) $ (0.02) $ (0.79) $ (0.68) $ (1.09)
Diluted (in dollars per share) $ (0.02) $ (0.79) $ (0.68) $ (1.09)
Weighted-average number of shares outstanding:        
Basic (in shares) 27,391 27,279 27,377 27,271
Diluted (in shares) 27,391 27,279 27,377 27,271
Revenue from Contract with Customer, Product and Service [Extensible Enumeration] anab:CollaborationRevenueMember anab:CollaborationRevenueMember anab:CollaborationRevenueMember anab:CollaborationRevenueMember