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Supplementary Balance Sheet Information - Investments Available-for-sale (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Maturity less than 1 year:
Amortized Cost	$ 42,817	$ 26,293
Gross Unrealized Gains	18	33
Gross Unrealized Losses	(140)	(17)
Fair Market Value	42,695	26,309
Maturity 1 to 2 years:
Amortized Cost	5,844	26,942
Gross Unrealized Gains	13	6
Gross Unrealized Losses	(23)	(89)
Fair Market Value	5,834	26,859
Amortized Cost	48,661	53,235
Gross Unrealized Gains	31	39
Gross Unrealized Losses	(163)	(106)
Fair Market Value	48,529	53,168
Certificate of deposit
Maturity less than 1 year:
Amortized Cost	6,501	8,317
Gross Unrealized Gains	10	16
Gross Unrealized Losses	0	0
Fair Market Value	6,511	8,333
Corporate debt securities
Maturity less than 1 year:
Amortized Cost	14,686	10,948
Gross Unrealized Gains	6	8
Gross Unrealized Losses	(27)	(16)
Fair Market Value	14,665	10,940
Maturity 1 to 2 years:
Amortized Cost	3,654	8,437
Gross Unrealized Gains	13	6
Gross Unrealized Losses	(4)	(10)
Fair Market Value	3,663	8,433
Commercial paper
Maturity less than 1 year:
Amortized Cost	5,288	6,193
Gross Unrealized Gains	2	9
Gross Unrealized Losses	(1)	0
Fair Market Value	5,289	6,202
Non U.S. government
Maturity less than 1 year:
Amortized Cost		835
Gross Unrealized Gains		0
Gross Unrealized Losses		(1)
Fair Market Value		834
U.S. treasury securities
Maturity less than 1 year:
Amortized Cost	16,342
Gross Unrealized Gains	0
Gross Unrealized Losses	(112)
Fair Market Value	16,230
Maturity 1 to 2 years:
Amortized Cost	2,190	18,505
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(19)	(79)
Fair Market Value	$ 2,171	$ 18,426

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