Amortized Cost and Fair Value of Available-for-Sale Investments (Detail) - USD ($) $ in Thousands	Jul. 01, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 161,098	$ 169,293
Gross Unrealized Gains	2	1
Gross Unrealized Losses	9,769	10,764
Fair Value	151,331	158,530
Money market investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6,264	21,910
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	6,264	21,910
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	17,639	18,905
Gross Unrealized Gains	0	0
Gross Unrealized Losses	2,705	2,889
Fair Value	14,934	16,016
Corporate bonds and direct obligations of government agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	121,137	126,134
Gross Unrealized Gains	1	1
Gross Unrealized Losses	6,962	7,775
Fair Value	114,176	118,360
U.S. Treasury obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	16,058	2,344
Gross Unrealized Gains	1	0
Gross Unrealized Losses	102	100
Fair Value	$ 15,957	$ 2,244