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FAIR VALUE MEASUREMENT - Assets and Liabilities Measured At Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Assets:      
Cash equivalents—Money market funds $ 22,492 $ 21,799  
Equity securities, fair value 31,638 21,640  
Available-for-sale debt securities 13,989 10,985  
Debt securities, at fair value 11,736 14,814  
Total assets 79,855 69,238  
Liabilities:      
Loan commitments, at fair value 2,766 0 $ 0
Total liabilities 2,766    
Level 1      
Assets:      
Cash equivalents—Money market funds 22,492 21,799  
Equity securities, fair value 14,563 0  
Available-for-sale debt securities 0 0  
Debt securities, at fair value 0 0  
Total assets 37,055 21,799  
Liabilities:      
Loan commitments, at fair value 0    
Total liabilities 0    
Level 2      
Assets:      
Cash equivalents—Money market funds 0 0  
Equity securities, fair value 0 0  
Available-for-sale debt securities 0 0  
Debt securities, at fair value 0 0  
Total assets 0 0  
Liabilities:      
Loan commitments, at fair value 0    
Total liabilities 0    
Level 3      
Assets:      
Cash equivalents—Money market funds 0 0  
Equity securities, fair value 17,075 21,640  
Available-for-sale debt securities 13,989 10,985  
Debt securities, at fair value 11,736 14,814  
Total assets 42,800 $ 47,439  
Liabilities:      
Loan commitments, at fair value 2,766    
Total liabilities $ 2,766