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Supplementary Balance Sheet Information - Investments Available-for-sale (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Maturity less than 1 year:
Amortized Cost	$ 41,413	$ 84,299
Gross Unrealized Gains	5	19
Gross Unrealized Losses	(119)	(394)
Fair Market Value	41,299	83,924
Maturity 1 to 2 years:
Amortized Cost	29,077	5,016
Gross Unrealized Gains	16	1
Gross Unrealized Losses	(333)	(21)
Fair Market Value	28,760	4,996
Amortized Cost	70,490	89,315
Gross Unrealized Gains	21	20
Gross Unrealized Losses	(452)	(415)
Fair Market Value	70,059	88,920
Certificate of deposit
Maturity less than 1 year:
Amortized Cost	8,005	16,101
Gross Unrealized Gains	0	3
Gross Unrealized Losses	(14)	(81)
Fair Market Value	7,991	16,023
Corporate debt securities
Maturity less than 1 year:
Amortized Cost	14,465	44,806
Gross Unrealized Gains	5	8
Gross Unrealized Losses	(53)	(275)
Fair Market Value	14,417	44,539
Maturity 1 to 2 years:
Amortized Cost	8,711	5,016
Gross Unrealized Gains	16	1
Gross Unrealized Losses	(82)	(21)
Fair Market Value	8,645	4,996
Commercial paper
Maturity less than 1 year:
Amortized Cost	11,102	13,203
Gross Unrealized Gains	0	4
Gross Unrealized Losses	(13)	(20)
Fair Market Value	11,089	13,187
U.S. government agencies
Maturity less than 1 year:
Amortized Cost	7,841
Gross Unrealized Gains	0
Gross Unrealized Losses	(39)
Fair Market Value	7,802
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		7,905
Gross Unrealized Gains		0
Gross Unrealized Losses		(18)
Fair Market Value		$ 7,887
Maturity 1 to 2 years:
Amortized Cost	20,366
Gross Unrealized Gains	0
Gross Unrealized Losses	(251)
Fair Market Value	$ 20,115

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