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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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