Investments in Available-for-Sale Securities - Schedule of investments (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, Cost Basis	$ 33,667	$ 37,014
Available-for-sale, Gross Unrealized Gains	16	21
Available-for-sale, Gross Unrealized Losses	(76)	(42)
Available-for-sale, Fair Value	33,607	36,993
U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, Cost Basis	28,700	28,325
Available-for-sale, Gross Unrealized Gains	1	1
Available-for-sale, Gross Unrealized Losses	(56)	(25)
Available-for-sale, Fair Value	28,645	28,301
Corporate notes and bonds
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, Cost Basis	4,967	8,689
Available-for-sale, Gross Unrealized Gains	15	20
Available-for-sale, Gross Unrealized Losses	(20)	(17)
Available-for-sale, Fair Value	$ 4,962	$ 8,692