Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Investments
Investments - Available-for-sale	$ 98,031	$ 61,295
Available-for-sale investments
Adjusted Cost	98,105
Gross Unrealized Gains	243
Gross Unrealized (Losses)	(317)
Estimated Fair Value	98,031
Net unrealized gains and losses on available-for-sale debt securities	476	$ 533
Corporate bonds
Available-for-sale investments
Adjusted Cost	79,085
Gross Unrealized Gains	243
Gross Unrealized (Losses)	(308)
Estimated Fair Value	79,020
Agency bonds
Available-for-sale investments
Adjusted Cost	19,020
Gross Unrealized (Losses)	(9)
Estimated Fair Value	$ 19,011