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Fair Value Measurements - Financial assets and liabilities (Details)
$ in Thousands
1 Months Ended
Mar. 31, 2024
instrument
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Assets:      
Number of Freestanding Financial Instruments | instrument 2    
Series C redeemable convertible preferred stock      
Assets:      
Number of Freestanding Financial Instruments | instrument 2    
Recurring      
Assets:      
Total assets   $ 287,584 $ 26,266
Recurring | Money market funds      
Assets:      
Cash equivalents   168,847 21,310
Recurring | U.S. treasuries      
Assets:      
Cash equivalents     2,000
Marketable securities   118,737 2,956
Level 1 | Recurring      
Assets:      
Total assets   215,984 25,268
Level 1 | Recurring | Money market funds      
Assets:      
Cash equivalents   168,847 21,310
Level 1 | Recurring | U.S. treasuries      
Assets:      
Cash equivalents     2,000
Marketable securities   47,137 1,958
Level 2 | Recurring      
Assets:      
Total assets   71,600 998
Level 2 | Recurring | U.S. treasuries      
Assets:      
Marketable securities   $ 71,600 $ 998