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Summary of Available-for-Sale Securities (Detail) - USD ($) | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | $ 62,260,000 | $ 60,456,000 |
Gross Unrealized Gain | 107,000 | 26,000 |
Gross Unrealized Loss | (408,000) | (1,215,000) |
Allowance for Credit Loss | 0 | 0 | $ 0
Fair Value | 61,959,000 | 59,267,000 |
Money market funds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 1,773,000 | 5,062,000 |
Gross Unrealized Gain | 0 | 0 |
Gross Unrealized Loss | 0 | 0 |
Allowance for Credit Loss | 0 | 0 |
Fair Value | 1,773,000 | 5,062,000 |
United States government agency securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 24,060,000 | 19,652,000 |
Gross Unrealized Gain | 54,000 | 16,000 |
Gross Unrealized Loss | (52,000) | (314,000) |
Allowance for Credit Loss | 0 | 0 |
Fair Value | 24,062,000 | 19,354,000 |
Corporate debt securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 33,357,000 | 32,395,000 |
Gross Unrealized Gain | 53,000 | 3,000 |
Gross Unrealized Loss | (39,000) | (638,000) |
Allowance for Credit Loss | 0 | 0 |
Fair Value | 33,371,000 | 31,760,000 |
Mortgage-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 3,070,000 | 3,347,000 |
Gross Unrealized Gain | 0 | 7,000 |
Gross Unrealized Loss | (317,000) | (263,000) |
Allowance for Credit Loss | 0 | 0 |
Fair Value | $ 2,753,000 | $ 3,091,000 |

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