Financial Instruments - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financial Instruments [Line Items]
Period cash equivalents and short-term investments have been in continuous unrealized gain (loss) position, years, maximum	1 year
Total short-term investments (available for sale), Fair value	$ 485,135,000	$ 399,315,000
Non controlling interest	1,200,000
Gain (loss) from investment in affiliate		(1,800,000)	$ 200,000
Impairment of equity method investments		1,200,000
Realized gains (losses)	$ 0	0
Equity Affiliate [Member]
Financial Instruments [Line Items]
Percentage of investment in equity affiliate	30.70%
Maximum [Member]
Financial Instruments [Line Items]
Gain (loss) from investment in affiliate	$ 100,000
Realized gains (losses)			$ 100,000
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Instruments [Line Items]
Total short-term investments (available for sale), Fair value	30,300,000	$ 40,100,000
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	$ 44,900,000