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Fair Value Measurements - Fair Value of Financial Instruments (Details) - USD ($)
Dec. 31, 2024
Dec. 31, 2023
Assets:    
Total $ 0 $ 4,396,000
Level 1 [Member]    
Assets:    
Total 0 1,505,000
Level 2 [Member]    
Assets:    
Total 0 2,891,000
Level 3 [Member]    
Assets:    
Total 0 0
Mutual funds [Member]    
Assets:    
Total 0 1,505,000
Mutual funds [Member] | Level 1 [Member]    
Assets:    
Total 0 1,505,000
Mutual funds [Member] | Level 2 [Member]    
Assets:    
Total 0 0
Mutual funds [Member] | Level 3 [Member]    
Assets:    
Total 0 0
US Treasury securities [Member]    
Assets:    
Total 0 1,803,000
US Treasury securities [Member] | Level 1 [Member]    
Assets:    
Total 0 0
US Treasury securities [Member] | Level 2 [Member]    
Assets:    
Total 0 1,803,000
US Treasury securities [Member] | Level 3 [Member]    
Assets:    
Total 0 0
Certificates of deposit [Member]    
Assets:    
Total 0 103,000
Certificates of deposit [Member] | Level 1 [Member]    
Assets:    
Total 0 0
Certificates of deposit [Member] | Level 2 [Member]    
Assets:    
Total 0 103,000
Certificates of deposit [Member] | Level 3 [Member]    
Assets:    
Total 0 0
Corporate bonds and notes [Member]    
Assets:    
Total 0 985,000
Corporate bonds and notes [Member] | Level 1 [Member]    
Assets:    
Total 0 0
Corporate bonds and notes [Member] | Level 2 [Member]    
Assets:    
Total 0 985,000
Corporate bonds and notes [Member] | Level 3 [Member]    
Assets:    
Total $ 0 $ 0