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Fair Values on Financial Assets and Liabilities (Detail) - USD ($) | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Fair value of financial assets and liabilities |  |  |
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 |
Total financial assets | 81,041,000 | 88,340,000 |
Short-term Investments |  |  |
Fair value of financial assets and liabilities |  |  |
Total short-term investments | 81,041,000 | 87,770,000 |
Money market funds |  |  |
Fair value of financial assets and liabilities |  |  |
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 |
Total short-term investments | 14,472,000 | 7,170,000 |
United States government agency securities |  |  |
Fair value of financial assets and liabilities |  |  |
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 |
United States government agency securities | Short-term Investments |  |  |
Fair value of financial assets and liabilities |  |  |
Total short-term investments | 26,423,000 | 25,685,000 |
Corporate debt securities |  |  |
Fair value of financial assets and liabilities |  |  |
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 |
Corporate debt securities | Short-term Investments |  |  |
Fair value of financial assets and liabilities |  |  |
Total short-term investments | 36,795,000 | 52,560,000 |
Mortgage-backed securities |  |  |
Fair value of financial assets and liabilities |  |  |
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 |
Mortgage-backed securities | Short-term Investments |  |  |
Fair value of financial assets and liabilities |  |  |
Total short-term investments | 3,351,000 | 2,355,000 |
Warrant | Other Assets |  |  |
Fair value of financial assets and liabilities |  |  |
Warrants |  | 570,000 |
Level 1 |  |  |
Fair value of financial assets and liabilities |  |  |
Total financial assets | 14,472,000 | 7,170,000 |
Level 1 | Short-term Investments |  |  |
Fair value of financial assets and liabilities |  |  |
Total short-term investments | 14,472,000 | 7,170,000 |
Level 1 | Money market funds |  |  |
Fair value of financial assets and liabilities |  |  |
Total short-term investments | 14,472,000 | 7,170,000 |
Level 2 |  |  |
Fair value of financial assets and liabilities |  |  |
Total financial assets | 66,569,000 | 80,600,000 |
Level 2 | Short-term Investments |  |  |
Fair value of financial assets and liabilities |  |  |
Total short-term investments | 66,569,000 | 80,600,000 |
Level 2 | United States government agency securities | Short-term Investments |  |  |
Fair value of financial assets and liabilities |  |  |
Total short-term investments | 26,423,000 | 25,685,000 |
Level 2 | Corporate debt securities | Short-term Investments |  |  |
Fair value of financial assets and liabilities |  |  |
Total short-term investments | 36,795,000 | 52,560,000 |
Level 2 | Mortgage-backed securities | Short-term Investments |  |  |
Fair value of financial assets and liabilities |  |  |
Total short-term investments | $ 3,351,000 | 2,355,000 |
Level 3 |  |  |
Fair value of financial assets and liabilities |  |  |
Total financial assets |  | 570,000 |
Level 3 | Warrant | Other Assets |  |  |
Fair value of financial assets and liabilities |  |  |
Warrants |  | $ 570,000 |

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