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Fair Value Measurements - Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Fair Value Measurements        
Marketable securities $ 223,899   $ 229,177  
Investments 181,000   $ 86,997  
Liabilities        
Available-for-sale securities purchased $ 185,237 $ 41,825    
Commercial paper | Marketable securities | Maximum        
Fair Value Measurements        
Financial Instrument Maturity Period 1 year   1 year  
Corporate bonds | Marketable securities | Maximum        
Fair Value Measurements        
Financial Instrument Maturity Period 1 year   1 year  
Corporate bonds | Investments | Maximum        
Fair Value Measurements        
Financial Instrument Maturity Period 5 years   5 years  
Government bonds | Marketable securities | Maximum        
Fair Value Measurements        
Financial Instrument Maturity Period 1 year   1 year  
Government bonds | Investments | Maximum        
Fair Value Measurements        
Financial Instrument Maturity Period 5 years   5 years  
U.S. treasuries | Marketable securities | Maximum        
Fair Value Measurements        
Financial Instrument Maturity Period 1 year   1 year  
Recurring | Marketable securities        
Fair Value Measurements        
Marketable securities $ 223,899   $ 229,177  
Recurring | Investments        
Fair Value Measurements        
Investments 181,000   86,997  
Recurring | Public Warrants | Warrant liabilities        
Liabilities        
Liabilities 3,745     $ 9,911
Recurring | Private Placement Warrants | Warrant liabilities        
Liabilities        
Liabilities 495     3,970
Recurring | Level 1 | Public Warrants | Warrant liabilities        
Liabilities        
Liabilities 3,745     9,911
Recurring | Level 2 | Private Placement Warrants | Warrant liabilities        
Liabilities        
Liabilities 495     3,970
Recurring | Level 3        
Liabilities        
Transfers in or out of Level 3 0   0  
Recurring | Commercial paper | Marketable securities        
Fair Value Measurements        
Marketable securities 56,848   62,166  
Assets        
Assets 56,848     62,167
Recurring | Commercial paper | Level 1 | Marketable securities        
Assets        
Assets 56,848     62,167
Recurring | Corporate bonds | Marketable securities        
Fair Value Measurements        
Marketable securities 126,690   122,941  
Assets        
Assets 126,690     122,941
Recurring | Corporate bonds | Investments        
Fair Value Measurements        
Investments 158,155   63,187  
Assets        
Assets 158,155     63,187
Recurring | Corporate bonds | Level 1 | Marketable securities        
Assets        
Assets 126,690     122,941
Recurring | Corporate bonds | Level 1 | Investments        
Assets        
Assets 158,155     63,187
Recurring | Government bonds | Marketable securities        
Fair Value Measurements        
Marketable securities 29,405   39,053  
Assets        
Assets 29,405     39,053
Recurring | Government bonds | Investments        
Fair Value Measurements        
Investments 21,709   22,479  
Assets        
Assets 21,709     22,479
Recurring | Government bonds | Level 1 | Marketable securities        
Assets        
Assets 29,405     39,053
Recurring | Government bonds | Level 1 | Investments        
Assets        
Assets 21,709     22,479
Recurring | U.S. treasuries | Marketable securities        
Fair Value Measurements        
Marketable securities 10,956   5,017  
Assets        
Assets 10,956     5,017
Recurring | U.S. treasuries | Level 1 | Marketable securities        
Assets        
Assets 10,956     5,017
Recurring | Equity Method Investment | Investments        
Fair Value Measurements        
Investments 1,136   $ 1,331  
Recurring | Bifurcated embedded derivative | Loan receivable from equity method investee        
Assets        
Assets 584     584
Recurring | Bifurcated embedded derivative | Level 3 | Loan receivable from equity method investee        
Assets        
Assets $ 584     $ 584