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Fair Values on Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Fair value of financial assets and liabilities |  |
Total financial assets | $ 103,625 | $ 59,592
Total financial assets | 103,625 | 59,592
Money market funds |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | 6,203 | 8,860
Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | 103,203 |
United States government agency securities | Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | 30,683 | 15,561
Corporate debt securities | Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | 66,317 | 35,171
Warrant | Other Assets |  |
Fair value of financial assets and liabilities |  |
Warrants | 422 |
Level 1 |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 6,203 | 8,860
Total financial assets | 6,203 | 8,860
Level 1 | Money market funds |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | 6,203 | 8,860
Level 1 | Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | 6,203 |
Level 2 |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 97,000 | 50,732
Total financial assets | 97,000 | 50,732
Level 2 | Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | 97,000 |
Level 2 | United States government agency securities | Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | 30,683 | 15,561
Level 2 | Corporate debt securities | Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Total short-term investments | 66,317 | $ 35,171
Level 3 |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 422 |
Total financial assets | 422 |
Level 3 | Warrant | Other Assets |  |
Fair value of financial assets and liabilities |  |
Warrants | $ 422 |

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