Investments in Available-for-Sale Securities - Schedule of investments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, Cost Basis	$ 32,715	$ 37,014
Available-for-sale, Gross Unrealized Gains	15	21
Available-for-sale, Gross Unrealized Losses	(6)	(42)
Available-for-sale, Fair Value	32,724	36,993
U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, Cost Basis	28,764	28,325
Available-for-sale, Gross Unrealized Gains	14	1
Available-for-sale, Gross Unrealized Losses	(5)	(25)
Available-for-sale, Fair Value	28,773	28,301
Corporate notes and bonds
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, Cost Basis	3,951	8,689
Available-for-sale, Gross Unrealized Gains	1	20
Available-for-sale, Gross Unrealized Losses	(1)	(17)
Available-for-sale, Fair Value	$ 3,951	$ 8,692