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Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (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] |  |
Money market funds, amortized cost | $ 254,045 | $ 386,569
Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Gross unrealized gains | 0 |
Gross unrealized losses | (326) |
Total Amortized Cost | 319,051 |
Total Fair Value | 318,725 |
Level 1 [Member] | Fair Value, Recurring [Member] | Long-Term Investments - U.S. Treasury Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 65,106 |
Gross unrealized gains | 0 |
Gross unrealized losses | (326) |
Fair Value | 64,780 |
Level 1 [Member] | Fair Value, Recurring [Member] | Money Market Funds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Money market funds, amortized cost | 253,945 | 386,369
Money market funds, fair value | $ 253,945 | $ 386,369

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