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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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