Investments (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Investments
Investments - Available-for-sale	$ 90,444		$ 61,295
Available-for-sale investments
Adjusted Cost	91,350
Gross Unrealized Gains	1
Gross Unrealized (Losses)	(907)
Estimated Fair Value	90,444
Net unrealized loss on available-for-sale debt securities	157	$ 398
Corporate bonds
Available-for-sale investments
Adjusted Cost	67,412
Gross Unrealized Gains	1
Gross Unrealized (Losses)	(835)
Estimated Fair Value	66,578
Commercial paper
Available-for-sale investments
Adjusted Cost	4,918
Gross Unrealized (Losses)	(2)
Estimated Fair Value	4,916
Agency bonds
Available-for-sale investments
Adjusted Cost	19,020
Gross Unrealized (Losses)	(70)
Estimated Fair Value	$ 18,950