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Cash and Cash Equivalents (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Cash |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | $ 96,649 | $ 196,106
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 96,649 | 196,106
Money market securities |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 51,794 | 101,581
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 51,794 | 101,581
Total cash equivalents |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 51,794 | 101,581
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 51,794 | 101,581
Total cash and cash equivalents |  |
Fair Value Measurements [Line Items] |  |
Amortized Cost | 148,443 | 297,687
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 148,443 | $ 297,687

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