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Investments (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Investments
Investments - Available-for-sale	$ 97,553		$ 61,295
Available-for-sale investments
Adjusted Cost	98,331
Gross Unrealized (Losses)	(778)
Estimated Fair Value	97,553
Net unrealized loss on available-for-sale debt securities	60	$ 417
Corporate bonds
Available-for-sale investments
Adjusted Cost	74,323
Gross Unrealized (Losses)	(742)
Estimated Fair Value	73,581
Commercial paper
Available-for-sale investments
Adjusted Cost	4,988
Gross Unrealized (Losses)	(1)
Estimated Fair Value	4,987
Agency bonds
Available-for-sale investments
Adjusted Cost	19,020
Gross Unrealized (Losses)	(35)
Estimated Fair Value	$ 18,985

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