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Supplementary Balance Sheet Information - Short-term Investments (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
Maturity less than 1 year: |  |
Amortized Cost | $ 84,299,000 | $ 95,643,000
Gross Unrealized Gains | 19,000 | 6,000
Gross Unrealized Losses | (394,000) | (65,000)
Fair Market Value | 83,924,000 | 95,584,000
Maturity 1 to 2 years: |  |
Amortized Cost | 5,016,000 | 33,377,000
Gross Unrealized Gains | 1,000 | 1,000
Gross Unrealized Losses | (21,000) | (84,000)
Fair Market Value | 4,996,000 | 33,294,000
Amortized Cost | 89,315,000 | 129,020,000
Gross Unrealized Gains | 20,000 | 7,000
Gross Unrealized Losses | (415,000) | (149,000)
Fair Market Value | 88,920,000 | 128,878,000
Realized loss | 200,000 |
Certificate of deposit |  |
Maturity less than 1 year: |  |
Amortized Cost | 16,101,000 | 1,260,000
Gross Unrealized Gains | 3,000 | 0
Gross Unrealized Losses | (81,000) | 0
Fair Market Value | 16,023,000 | 1,260,000
Corporate debt securities |  |
Maturity less than 1 year: |  |
Amortized Cost | 44,806,000 | 58,822,000
Gross Unrealized Gains | 8,000 | 2,000
Gross Unrealized Losses | (275,000) | (38,000)
Fair Market Value | 44,539,000 | 58,786,000
Maturity 1 to 2 years: |  |
Amortized Cost | 5,016,000 | 29,676,000
Gross Unrealized Gains | 1,000 | 1,000
Gross Unrealized Losses | (21,000) | (73,000)
Fair Market Value | 4,996,000 | 29,604,000
Commercial paper |  |
Maturity less than 1 year: |  |
Amortized Cost | 13,203,000 | 14,453,000
Gross Unrealized Gains | 4,000 | 4,000
Gross Unrealized Losses | (20,000) | (3,000)
Fair Market Value | 13,187,000 | 14,454,000
U.S. government agencies |  |
Maturity less than 1 year: |  |
Amortized Cost | 2,284,000 |
Gross Unrealized Gains | 4,000 |
Gross Unrealized Losses | 0 |
Fair Market Value | 2,288,000 |
Non U.S. government |  |
Maturity less than 1 year: |  |
Amortized Cost |  | 728,000
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Fair Market Value |  | 728,000
U.S. treasury securities |  |
Maturity less than 1 year: |  |
Amortized Cost | 7,905,000 | 20,380,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (18,000) | (24,000)
Fair Market Value | $ 7,887,000 | 20,356,000
Maturity 1 to 2 years: |  |
Amortized Cost |  | 3,701,000
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (11,000)
Fair Market Value |  | $ 3,690,000

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