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Marketable Securities - Available-for-sale Securities by Major Security Type (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Marketable Securities [Line Items]    
Amortized cost $ 2,468 $ 4,412
Gross unrealized holding gains 6 7
Gross unrealized holding losses (1) (23)
Estimated fair value 2,473 4,396
US Treasury securities [Member]    
Marketable Securities [Line Items]    
Amortized cost 505 1,804
Gross unrealized holding gains 0 0
Gross unrealized holding losses 0 (1)
Estimated fair value 505 1,803
Mutual Funds [Member]    
Marketable Securities [Line Items]    
Amortized cost 1,545 1,498
Gross unrealized holding gains 6 7
Gross unrealized holding losses (1) 0
Estimated fair value 1,550 1,505
Certificates of Deposit [Member]    
Marketable Securities [Line Items]    
Amortized cost 418 103
Gross unrealized holding gains 0 0
Gross unrealized holding losses 0 0
Estimated fair value 418 103
Corporate debt securities [Member]    
Marketable Securities [Line Items]    
Amortized cost 0 1,007
Gross unrealized holding gains 0 0
Gross unrealized holding losses 0 (22)
Estimated fair value $ 0 $ 985