Equity - Changes in Accumulated Other Comprehensive Income by Component (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2024	Sep. 30, 2023	Sep. 28, 2024	Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 112,589	$ 117,003	$ 115,517	$ 123,452
Other comprehensive income (loss), net of tax	496	86	441	89
Ending balance	112,345	116,237	112,345	116,237
Foreign currency
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	48	72	159	291
Other comprehensive income (loss) before reclassification	339	(15)	228	(234)
Amounts reclassified from other comprehensive income (loss)	0	0	0	0
Other comprehensive income (loss), net of tax	339	(15)	228	(234)
Ending balance	387	57	387	57
Unrealized holding gains(losses) on available-for-sale investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(6)	(262)	(62)	(484)
Other comprehensive income (loss) before reclassification	157	101	213	323
Amounts reclassified from other comprehensive income (loss)	0	0	0	0
Other comprehensive income (loss), net of tax	157	101	213	323
Ending balance	151	(161)	151	(161)
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	42	(190)	97	(193)
Other comprehensive income (loss) before reclassification	496	86	441	89
Amounts reclassified from other comprehensive income (loss)	0	0	0	0
Other comprehensive income (loss), net of tax	496	86	441	89
Ending balance	$ 538	$ (104)	$ 538	$ (104)