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Supplementary Balance Sheet Information - Investments Available-for-sale (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Maturity less than 1 year: |  |
Amortized Cost | $ 35,751 | $ 26,293
Gross Unrealized Gains | 46 | 33
Gross Unrealized Losses | (12) | (17)
Fair Market Value | 35,785 | 26,309
Maturity 1 to 2 years: |  |
Amortized Cost | 8,796 | 26,942
Gross Unrealized Gains | 49 | 6
Gross Unrealized Losses | (1) | (89)
Fair Market Value | 8,844 | 26,859
Amortized Cost | 44,547 | 53,235
Gross Unrealized Gains | 95 | 39
Gross Unrealized Losses | (13) | (106)
Fair Market Value | 44,629 | 53,168
Certificate of deposit |  |
Maturity less than 1 year: |  |
Amortized Cost | 334 | 8,317
Gross Unrealized Gains | 0 | 16
Gross Unrealized Losses | 0 | 0
Fair Market Value | 334 | 8,333
Corporate debt securities |  |
Maturity less than 1 year: |  |
Amortized Cost | 16,213 | 10,948
Gross Unrealized Gains | 36 | 8
Gross Unrealized Losses | (2) | (16)
Fair Market Value | 16,247 | 10,940
Maturity 1 to 2 years: |  |
Amortized Cost | 8,796 | 8,437
Gross Unrealized Gains | 49 | 6
Gross Unrealized Losses | (1) | (10)
Fair Market Value | 8,844 | 8,433
Commercial paper |  |
Maturity less than 1 year: |  |
Amortized Cost | 308 | 6,193
Gross Unrealized Gains | 2 | 9
Gross Unrealized Losses | 0 | 0
Fair Market Value | 310 | 6,202
U.S. government agencies |  |
Maturity less than 1 year: |  |
Amortized Cost |  | 835
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (1)
Fair Market Value |  | 834
U.S. treasury securities |  |
Maturity less than 1 year: |  |
Amortized Cost | 18,896 |
Gross Unrealized Gains | 8 |
Gross Unrealized Losses | (10) |
Fair Market Value | $ 18,894 |
Maturity 1 to 2 years: |  |
Amortized Cost |  | 18,505
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (79)
Fair Market Value |  | $ 18,426

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