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Cash Equivalents, Restricted Cash and Short-Term Investments Classified as Available-for-sale Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | $ 46,851 | $ 81,892
Gross Unrealized Gains |  | 5
Estimated Fair Value | 46,851 | 81,897
Federal Agency Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost |  | 13,697
Gross Unrealized Gains |  | 3
Estimated Fair Value |  | 13,700
Money Market Funds | Cash Equivalents |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 44,347 | 30,360
Estimated Fair Value | 44,347 | 30,360
U.S. Government Agency Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 2,504 | 37,835
Gross Unrealized Gains |  | 2
Estimated Fair Value | 2,504 | 37,837
Cash and Cash Equivalents |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated Fair Value | 44,347 | 30,360
Short-Term Investments |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated Fair Value | $ 2,504 | 48,994
Other Long-term Investments |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated Fair Value |  | $ 2,543

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