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Summary of Available-for-Sale Securities (Detail) - USD ($) | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | $ 64,208,000 | $ 62,260,000 |
Gross Unrealized Gain | 127,000 | 107,000 |
Gross Unrealized Loss | (213,000) | (408,000) |
Allowance for Credit Loss | 0 | 0 | $ 0
Fair Value | 64,122,000 | 61,959,000 |
Money market funds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 1,280,000 | 1,773,000 |
Gross Unrealized Gain | 0 | 0 |
Gross Unrealized Loss | 0 | 0 |
Allowance for Credit Loss | 0 | 0 |
Fair Value | 1,280,000 | 1,773,000 |
United States government agency securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 23,871,000 | 24,060,000 |
Gross Unrealized Gain | 46,000 | 54,000 |
Gross Unrealized Loss | (1,000) | (52,000) |
Allowance for Credit Loss | 0 | 0 |
Fair Value | 23,916,000 | 24,062,000 |
Corporate debt securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 36,200,000 | 33,357,000 |
Gross Unrealized Gain | 76,000 | 53,000 |
Gross Unrealized Loss | (2,000) | (39,000) |
Allowance for Credit Loss | 0 | 0 |
Fair Value | 36,274,000 | 33,371,000 |
Mortgage-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 2,857,000 | 3,070,000 |
Gross Unrealized Gain | 5,000 | 0 |
Gross Unrealized Loss | (210,000) | (317,000) |
Allowance for Credit Loss | 0 | 0 |
Fair Value | $ 2,652,000 | $ 2,753,000 |

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