Equity - Changes in Accumulated Other Comprehensive Income by Component (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2023	Jul. 02, 2022	Jul. 01, 2023	Jul. 02, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 120,848	$ 125,815	$ 123,452	$ 134,015
Other comprehensive income (loss), net of tax	(176)	(380)	3	(587)
Ending balance	117,003	125,160	117,003	125,160
Foreign currency
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	301	575	291	608
Other comprehensive income (loss) before reclassification	(229)	(219)	(219)	(252)
Amounts reclassified from other comprehensive income (loss)	0	0	0	0
Other comprehensive income (loss), net of tax	(229)	(219)	(219)	(252)
Ending balance	72	356	72	356
Unrealized holding gains (losses) on available- for-sale investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(315)	(204)	(484)	(30)
Other comprehensive income (loss) before reclassification	53	(161)	222	(335)
Amounts reclassified from other comprehensive income (loss)	0	0	0	0
Other comprehensive income (loss), net of tax	53	(161)	222	(335)
Ending balance	(262)	(365)	(262)	(365)
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(14)	371	(193)	578
Other comprehensive income (loss) before reclassification	(176)	(380)	3	(587)
Amounts reclassified from other comprehensive income (loss)	0	0	0	0
Other comprehensive income (loss), net of tax	(176)	(380)	3	(587)
Ending balance	$ (190)	$ (9)	$ (190)	$ (9)