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Fair Value Measurements - Schedule of Amortized Cost (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Amortized Cost | $ 26,278,000 |  | $ 26,278,000 |  | $ 74,201,000
Gross Unrealized Gains | 0 |  | 0 |  | 0
Gross Unrealized Losses | (457,000) |  | (457,000) |  | (1,486,000)
Fair Value | 25,821,000 |  | 25,821,000 |  | 72,715,000
Accrued interest receivable | 1,400,000 |  | 1,400,000 |  | 1,700,000
Realized gains (losses) on marketable securities | 0 | $ 0 | 0 | $ 0 |
U.S. Treasury securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Amortized Cost |  |  |  |  | 15,437,000
Gross Unrealized Gains |  |  |  |  | 0
Gross Unrealized Losses |  |  |  |  | (64,000)
Fair Value |  |  |  |  | 15,373,000
Yankee bonds |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Amortized Cost |  |  |  |  | 2,601,000
Gross Unrealized Gains |  |  |  |  | 0
Gross Unrealized Losses |  |  |  |  | (13,000)
Fair Value |  |  |  |  | 2,588,000
Agency bonds |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Amortized Cost | 2,491,000 |  | 2,491,000 |  | 6,056,000
Gross Unrealized Gains | 0 |  | 0 |  | 0
Gross Unrealized Losses | (11,000) |  | (11,000) |  | (56,000)
Fair Value | 2,480,000 |  | 2,480,000 |  | 6,000,000
Municipal bonds |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Amortized Cost | 9,597,000 |  | 9,597,000 |  | 12,694,000
Gross Unrealized Gains | 0 |  | 0 |  | 0
Gross Unrealized Losses | (228,000) |  | (228,000) |  | (597,000)
Fair Value | 9,369,000 |  | 9,369,000 |  | 12,097,000
Asset-backed securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Amortized Cost |  |  |  |  | 4,971,000
Gross Unrealized Gains |  |  |  |  | 0
Gross Unrealized Losses |  |  |  |  | (37,000)
Fair Value |  |  |  |  | 4,934,000
Corporate bonds |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Amortized Cost | 14,190,000 |  | 14,190,000 |  | 32,442,000
Gross Unrealized Gains | 0 |  | 0 |  | 0
Gross Unrealized Losses | (218,000) |  | (218,000) |  | (719,000)
Fair Value | $ 13,972,000 |  | $ 13,972,000 |  | $ 31,723,000

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