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Segment Information - Summary of Additional Information On Company's Net loss Including Segment Expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
General and administrative expense    
Other income and expense, net $ (7,433) $ (2,119)
Net loss (98,333) (66,394)
Operating Segments    
Research and development expense    
LX2020 23,451 14,192
LX2006 14,256 7,537
LX1001 4,501 9,936
Other programs 3,424 2,535
Employee compensation expenses 16,010 11,748
Lab-related costs and supplies 1,356 1,160
All other research and development expense 11,093 6,022
General and administrative expense    
Employee compensation expenses 13,158 5,872
All other general and administrative expense 18,517 9,511
Other income and expense, net (7,433) (2,119)
Net loss $ (98,333) $ (66,394)