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Supplementary Balance Sheet Information - Investments Available-for-sale (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Maturity less than 1 year:
Amortized Cost	$ 37,778	$ 84,299
Gross Unrealized Gains	6	19
Gross Unrealized Losses	(78)	(394)
Fair Market Value	37,706	83,924
Maturity 1 to 2 years:
Amortized Cost	28,759	5,016
Gross Unrealized Gains	3	1
Gross Unrealized Losses	(338)	(21)
Fair Market Value	28,424	4,996
Amortized Cost	66,537	89,315
Gross Unrealized Gains	9	20
Gross Unrealized Losses	(416)	(415)
Fair Market Value	66,130	88,920
Certificate of deposit
Maturity less than 1 year:
Amortized Cost	9,181	16,101
Gross Unrealized Gains	3	3
Gross Unrealized Losses	(3)	(81)
Fair Market Value	9,181	16,023
Corporate debt securities
Maturity less than 1 year:
Amortized Cost	12,194	44,806
Gross Unrealized Gains	3	8
Gross Unrealized Losses	(28)	(275)
Fair Market Value	12,169	44,539
Maturity 1 to 2 years:
Amortized Cost	10,281	5,016
Gross Unrealized Gains	3	1
Gross Unrealized Losses	(85)	(21)
Fair Market Value	10,199	4,996
Commercial paper
Maturity less than 1 year:
Amortized Cost	7,616	13,203
Gross Unrealized Gains	0	4
Gross Unrealized Losses	(3)	(20)
Fair Market Value	7,613	13,187
U.S. government agencies
Maturity less than 1 year:
Amortized Cost	6,852
Gross Unrealized Gains	0
Gross Unrealized Losses	(31)
Fair Market Value	6,821
Non U.S. government
Maturity less than 1 year:
Amortized Cost		2,284
Gross Unrealized Gains		4
Gross Unrealized Losses		0
Fair Market Value		2,288
U.S. treasury securities
Maturity less than 1 year:
Amortized Cost	1,935	7,905
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(13)	(18)
Fair Market Value	1,922	$ 7,887
Maturity 1 to 2 years:
Amortized Cost	18,478
Gross Unrealized Gains	0
Gross Unrealized Losses	(253)
Fair Market Value	$ 18,225

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