Investments in Available-for-Sale Securities - Schedule of investments (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, Cost Basis	$ 34,247	$ 32,715
Available-for-sale, Gross Unrealized Gains	16	15
Available-for-sale, Gross Unrealized Losses	(11)	(6)
Available-for-sale, Fair Value	34,252	32,724
U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, Cost Basis	31,291	28,764
Available-for-sale, Gross Unrealized Gains	12	14
Available-for-sale, Gross Unrealized Losses	(7)	(5)
Available-for-sale, Fair Value	31,296	28,773
Corporate notes and bonds
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, Cost Basis	2,956	3,951
Available-for-sale, Gross Unrealized Gains	4	1
Available-for-sale, Gross Unrealized Losses	(4)	(1)
Available-for-sale, Fair Value	$ 2,956	$ 3,951