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Supplementary Balance Sheet Information - Investments Available-for-sale (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Maturity less than 1 year:
Amortized Cost	$ 94,906	$ 95,643
Gross Unrealized Gains	5	6
Gross Unrealized Losses	(501)	(65)
Fair Market Value	94,410	95,584
Maturity 1 to 2 years:
Amortized Cost	15,152	33,377
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(252)	(84)
Fair Market Value	14,900	33,294
Amortized Cost	110,058	129,020
Gross Unrealized Gains	5	7
Gross Unrealized Losses	(753)	(149)
Fair Market Value	109,310	128,878
Certificate of deposit
Maturity less than 1 year:
Amortized Cost	9,250	1,260
Gross Unrealized Gains	4	0
Gross Unrealized Losses	(15)	0
Fair Market Value	9,239	1,260
Corporate debt securities
Maturity less than 1 year:
Amortized Cost	55,056	58,822
Gross Unrealized Gains	1	2
Gross Unrealized Losses	(293)	(38)
Fair Market Value	54,764	58,786
Maturity 1 to 2 years:
Amortized Cost	15,152	29,676
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(252)	(73)
Fair Market Value	14,900	29,604
Commercial paper
Maturity less than 1 year:
Amortized Cost	10,539	14,453
Gross Unrealized Gains	0	4
Gross Unrealized Losses	(71)	(3)
Fair Market Value	10,468	14,454
Non U.S. government
Maturity less than 1 year:
Amortized Cost		728
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Market Value		728
U.S. treasury securities
Maturity less than 1 year:
Amortized Cost	20,061	20,380
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(122)	(24)
Fair Market Value	$ 19,939	20,356
Maturity 1 to 2 years:
Amortized Cost		3,701
Gross Unrealized Gains		0
Gross Unrealized Losses		(11)
Fair Market Value		$ 3,690

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