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Fair Values on Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair value of financial assets and liabilities
Total financial assets	$ 88,474	$ 103,625
Money market funds
Fair value of financial assets and liabilities
Total short-term investments	13,714	6,203
Short-term Investments
Fair value of financial assets and liabilities
Total short-term investments	87,832	103,203
United States government agency securities | Short-term Investments
Fair value of financial assets and liabilities
Total short-term investments	20,082	30,683
Corporate debt securities | Short-term Investments
Fair value of financial assets and liabilities
Total short-term investments	54,036	66,317
Warrant | Other Assets
Fair value of financial assets and liabilities
Warrants	642	422
Level 1
Fair value of financial assets and liabilities
Total financial assets	13,714	6,203
Level 1 | Money market funds
Fair value of financial assets and liabilities
Total short-term investments	13,714	6,203
Level 1 | Short-term Investments
Fair value of financial assets and liabilities
Total short-term investments	13,714	6,203
Level 2
Fair value of financial assets and liabilities
Total financial assets	74,118	97,000
Level 2 | Short-term Investments
Fair value of financial assets and liabilities
Total short-term investments	74,118	97,000
Level 2 | United States government agency securities | Short-term Investments
Fair value of financial assets and liabilities
Total short-term investments	20,082	30,683
Level 2 | Corporate debt securities | Short-term Investments
Fair value of financial assets and liabilities
Total short-term investments	54,036	66,317
Level 3
Fair value of financial assets and liabilities
Total financial assets	642	422
Level 3 | Warrant | Other Assets
Fair value of financial assets and liabilities
Warrants	$ 642	$ 422

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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