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Fair Values on Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Fair value of financial assets and liabilities |  |
Total financial assets | $ 81,423 | $ 88,340
Money market funds |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | 6,351 | 7,170
Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | 81,089 | 87,770
United States government agency securities | Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | 24,750 | 25,685
Corporate debt securities | Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | 46,986 | 52,560
Mortgage-backed securities | Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | 3,002 | 2,355
Warrant | Other Assets |  |
Fair value of financial assets and liabilities |  |
Warrants | 334 | 570
Level 1 |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 6,351 | 7,170
Level 1 | Money market funds |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | 6,351 | 7,170
Level 1 | Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | 6,351 | 7,170
Level 2 |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 74,738 | 80,600
Level 2 | Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | 74,738 | 80,600
Level 2 | United States government agency securities | Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | 24,750 | 25,685
Level 2 | Corporate debt securities | Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | 46,986 | 52,560
Level 2 | Mortgage-backed securities | Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | 3,002 | 2,355
Level 3 |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 334 | 570
Level 3 | Warrant | Other Assets |  |
Fair value of financial assets and liabilities |  |
Warrants | $ 334 | $ 570

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