v3.26.1
Segment information - Schedule of Significant Segment Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
General and administrative expenses:    
Net loss $ (18,325) $ (14,985)
Operating Segment [Member]    
Segment Reporting Information [Line Items]    
Collaboration revenue 3,227 1,447
General and administrative expenses:    
Other segment items [1] 4,381 3,158
Net loss (18,325) (14,985)
Discovery and development | Operating Segment [Member]    
Direct external research and development expenses:    
External research and development (2,559) (3,718)
[225Ac]Ac-AKY-1189 | Operating Segment [Member]    
Direct external research and development expenses:    
External research and development (3,745) (2,907)
[225Ac]Ac-AKY-2519 | Operating Segment [Member]    
Direct external research and development expenses:    
External research and development (2,985) (755)
Research and Development Expense [Member] | Operating Segment [Member]    
Unallocated research and development expenses:    
Employee-related (including stock-based compensation) (7,390) (5,296)
Information technology, facilities, office and other [2] (3,357) (3,187)
General and administrative expenses:    
Employee-related (including stock-based compensation) (7,390) (5,296)
General and Administrative Expense [Member] | Operating Segment [Member]    
Unallocated research and development expenses:    
Employee-related (including stock-based compensation) (3,424) (1,995)
General and administrative expenses:    
Employee-related (including stock-based compensation) (3,424) (1,995)
Professional and consulting (1,917) (1,351)
Information technology, facilities, office and other [2] $ (556) $ (381)
[1] Other segment items consist of interest income and other expense, net. Interest income consists of interest earned on cash equivalents and marketable securities and amortization or accretion of discounts or premiums on marketable securities. Other expense, net consists of gains and losses on currency revaluation related to the payment of foreign vendor invoices.
[2] Information technology, facilities, office and other includes depreciation and amortization.