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Condensed Consolidated Statements of Operations and Comprehensive Loss (unaudited) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Income Statement [Abstract]        
Related-party revenue   $ 527   $ 1,182
Type of Revenue [Extensible List] alxo:RelatedPartyMember alxo:RelatedPartyMember alxo:RelatedPartyMember alxo:RelatedPartyMember
Operating expenses:        
Research and development $ 11,213 $ 7,663 $ 21,062 $ 11,491
General and administrative 5,086 3,172 9,445 4,645
Cost of services for related-party revenue   479   1,075
Total operating expenses 16,299 11,314 30,507 17,211
Loss from operations (16,299) (10,787) (30,507) (16,029)
Interest expense (3) (219) (6) (434)
Other income (expense), net 28 (305) 54 (298)
Loss before income taxes (16,274) (11,311) (30,459) (16,761)
Income tax provision   (20)   (24)
Net loss and comprehensive loss (16,274) (11,331) (30,459) (16,785)
Cumulative dividends allocated to preferred stockholders   (2,641)   (4,624)
Net loss attributable to common stockholders $ (16,274) $ (13,972) $ (30,459) $ (21,409)
Net loss per share attributable to common stockholders, basic and diluted $ (0.40) $ (4.41) $ (0.76) $ (6.78)
Weighted-average shares of common stock used to compute net loss per share attributable to common stockholders, basic and diluted 40,247,110 3,164,707 40,151,802 3,157,387