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Fair Value Measurements - Assets and Liabilities Carried at Fair Value Measured on Recurring Basis (Detail) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities	$ 32,965,000	$ 0
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	205,065,000	23,538,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	205,065,000	23,538,000
Cash Equivalents	172,100,000	23,538,000
Marketable Securities	32,965,000	0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	155,551,000
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	155,551,000
Cash Equivalents	155,551,000
Marketable Securities	0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	155,551,000	23,538,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	155,551,000	23,538,000
Cash Equivalents	155,551,000	23,538,000
Marketable Securities	0	$ 0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	49,514,000
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	49,514,000
Cash Equivalents	16,549,000
Marketable Securities	32,965,000
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	49,514,000
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	49,514,000
Cash Equivalents	16,549,000
Marketable Securities	$ 32,965,000

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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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Amount of investment in marketable security, classified as current.

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