Financial Instruments - Additional Information (Detail) - USD ($)		3 Months Ended		9 Months Ended
	Jul. 29, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Financial Instruments [Line Items]
Period cash equivalents and short-term investments have been in continuous unrealized gain (loss) position, years, maximum				1 year
Realized gains (losses)		$ 0	$ 0	$ 0	$ 0
Non controlling interest		1,200,000		1,200,000
Gain (loss) from investment in affiliate					$ (100,000)
Maximum [Member]
Financial Instruments [Line Items]
Gain (loss) from investment in affiliate		$ (100,000)	$ (100,000)	$ (10,000)
Credit Agreement | Revolving Credit Facility | Wintrust Bank [Member]
Financial Instruments [Line Items]
Credit facility borrowings	$ 0
Maturity date	Jan. 31, 2027
Equity Affiliate [Member]
Financial Instruments [Line Items]
Percentage of investment in equity affiliate		30.70%		30.70%
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Instruments [Line Items]
Total short-term investments (available for sale), Fair value		$ 30,500,000		$ 30,500,000		$ 30,300,000
Short-term, Non-governmental Debt Securities [Member]
Financial Instruments [Line Items]
Total short-term investments (available for sale), Fair value		225,783,000		225,783,000		245,713,000
Short-term, Non-governmental Debt Securities [Member] | Level 2 [Member]
Financial Instruments [Line Items]
Total short-term investments (available for sale), Fair value		20,900,000		20,900,000
Federal Agencies Debt Securities within Cash and Cash Equivalents [Member] | Level 2 [Member]
Financial Instruments [Line Items]
Total short-term investments (available for sale), Fair value		$ 53,200,000		$ 53,200,000		$ 44,900,000