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Supplementary Balance Sheet Information - Investments Available-for-sale (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Maturity less than 1 year:
Amortized Cost	$ 95,637	$ 95,643
Gross Unrealized Gains	1	6
Gross Unrealized Losses	(915)	(65)
Fair Market Value	94,723	95,584
Maturity 1 to 2 years:
Amortized Cost	6,386	33,377
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(68)	(84)
Fair Market Value	6,318	33,294
Amortized Cost	102,023	129,020
Gross Unrealized Gains	1	7
Gross Unrealized Losses	(983)	(149)
Fair Market Value	101,041	128,878
Certificate of deposit
Maturity less than 1 year:
Amortized Cost	12,922	1,260
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(63)	0
Fair Market Value	12,860	1,260
Corporate debt securities
Maturity less than 1 year:
Amortized Cost	59,453	58,822
Gross Unrealized Gains	0	2
Gross Unrealized Losses	(626)	(38)
Fair Market Value	58,827	58,786
Maturity 1 to 2 years:
Amortized Cost	4,616	29,676
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(57)	(73)
Fair Market Value	4,559	29,604
Commercial paper
Maturity less than 1 year:
Amortized Cost	10,228	14,453
Gross Unrealized Gains	0	4
Gross Unrealized Losses	(93)	(3)
Fair Market Value	10,135	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	13,034	20,380
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(133)	(24)
Fair Market Value	12,901	20,356
Maturity 1 to 2 years:
Amortized Cost	1,770	3,701
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(11)	(11)
Fair Market Value	$ 1,759	$ 3,690

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