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Supplementary Balance Sheet Information - Investments Available-for-sale (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Maturity less than 1 year:
Amortized Cost	$ 50,673	$ 84,299
Gross Unrealized Gains	12	19
Gross Unrealized Losses	(165)	(394)
Fair Market Value	50,520	83,924
Maturity 1 to 2 years:
Amortized Cost	31,354	5,016
Gross Unrealized Gains	104	1
Gross Unrealized Losses	(27)	(21)
Fair Market Value	31,431	4,996
Amortized Cost	82,027	89,315
Gross Unrealized Gains	116	20
Gross Unrealized Losses	(192)	(415)
Fair Market Value	81,951	88,920
Certificate of deposit
Maturity less than 1 year:
Amortized Cost	13,964	16,101
Gross Unrealized Gains	1	3
Gross Unrealized Losses	(40)	(81)
Fair Market Value	13,925	16,023
Corporate debt securities
Maturity less than 1 year:
Amortized Cost	22,258	44,806
Gross Unrealized Gains	4	8
Gross Unrealized Losses	(118)	(275)
Fair Market Value	22,144	44,539
Maturity 1 to 2 years:
Amortized Cost	10,687	5,016
Gross Unrealized Gains	24	1
Gross Unrealized Losses	(27)	(21)
Fair Market Value	10,684	4,996
Commercial paper
Maturity less than 1 year:
Amortized Cost	10,402	13,203
Gross Unrealized Gains	3	4
Gross Unrealized Losses	(7)	(20)
Fair Market Value	10,398	13,187
U.S. government agencies
Maturity less than 1 year:
Amortized Cost	4,049
Gross Unrealized Gains	4
Gross Unrealized Losses	0
Fair Market Value	4,053
Maturity 1 to 2 years:
Amortized Cost	3,781
Gross Unrealized Gains	8
Gross Unrealized Losses	0
Fair Market Value	3,789
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	16,886
Gross Unrealized Gains	72
Gross Unrealized Losses	0
Fair Market Value	$ 16,958

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