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Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Assets, fair value |  | $ 46,851 | $ 81,897
Money Market Funds |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Assets, fair value | [1] | 44,347 | 30,360
Fair Value, Inputs, Level 1 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Assets, fair value |  | 46,851 | 68,197
Fair Value, Inputs, Level 1 | Money Market Funds |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Assets, fair value | [1] | 44,347 | 30,360
Fair Value, Inputs, Level 2 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Assets, fair value |  |  | 13,700
U.S. Government Agency Securities |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Assets, fair value | [2] | 2,504 | 37,837
U.S. Government Agency Securities | Fair Value, Inputs, Level 1 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Assets, fair value | [2] | $ 2,504 | 37,837
Short-Term Investments | Federal Agency Securities |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Assets, fair value | [2] |  | 13,700
Short-Term Investments | Fair Value, Inputs, Level 2 | Federal Agency Securities |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Assets, fair value | [2] |  | $ 13,700
[1] | Included in cash and cash equivalents on accompanying consolidated balance sheet.
[2] | Included in short-term investments on accompanying consolidated balance sheet and are classified as available-for-sale debt securities. $2.5 million of U.S. government agency securities as of December 31, 2020 are included in long-term investments on the accompanying consolidated balance sheets due to the maturity being more than 12 months.

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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