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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
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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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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