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Summary of Available-for-Sale Securities (Detail) - USD ($) | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | $ 83,828,000 | $ 87,919,000 |
Gross Unrealized Gain | 50,000 | 106,000 |
Gross Unrealized Loss | (2,837,000) | (255,000) |
Allowance for Credit Loss | 0 | 0 | $ 0
Fair Value | 81,041,000 | 87,770,000 |
Money market funds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 14,472,000 | 7,170,000 |
Gross Unrealized Gain | 0 | 0 |
Gross Unrealized Loss | 0 | 0 |
Allowance for Credit Loss | 0 | 0 |
Fair Value | 14,472,000 | 7,170,000 |
United States government agency securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 27,200,000 | 25,761,000 |
Gross Unrealized Gain | 41,000 | 1,000 |
Gross Unrealized Loss | (818,000) | (77,000) |
Allowance for Credit Loss | 0 | 0 |
Fair Value | 26,423,000 | 25,685,000 |
Corporate debt securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 38,496,000 | 52,611,000 |
Gross Unrealized Gain | 2,000 | 105,000 |
Gross Unrealized Loss | (1,703,000) | (156,000) |
Allowance for Credit Loss | 0 | 0 |
Fair Value | 36,795,000 | 52,560,000 |
Mortgage-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 3,660,000 | 2,377,000 |
Gross Unrealized Gain | 7,000 | 0 |
Gross Unrealized Loss | (316,000) | (22,000) |
Allowance for Credit Loss | 0 | 0 |
Fair Value | $ 3,351,000 | $ 2,355,000 |

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