Marketable Securities - Available-for-sale Securities by Major Security Type (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Marketable Securities [Line Items]
Amortized cost	$ 4,080	$ 4,412
Gross unrealized holding gains	9	7
Gross unrealized holding losses	(2)	(23)
Estimated fair value	4,087	4,396
US Treasury securities [Member]
Marketable Securities [Line Items]
Amortized cost	1,298	1,804
Gross unrealized holding gains	0	0
Gross unrealized holding losses	0	(1)
Estimated fair value	1,298	1,803
Mutual funds [Member]
Marketable Securities [Line Items]
Amortized cost	2,116	1,498
Gross unrealized holding gains	9	7
Gross unrealized holding losses	(2)	0
Estimated fair value	2,123	1,505
Certificates of deposit [Member]
Marketable Securities [Line Items]
Amortized cost	413	103
Gross unrealized holding gains	0	0
Gross unrealized holding losses	0	0
Estimated fair value	413	103
Corporate debt securities [Member]
Marketable Securities [Line Items]
Amortized cost	253	1,007
Gross unrealized holding gains	0	0
Gross unrealized holding losses	0	(22)
Estimated fair value	$ 253	$ 985