Divestiture and Discontinued Operations - Summary of Components Discontinued Operations Related to Photonics Segment (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Oct. 01, 2022	Sep. 30, 2023	Oct. 01, 2022
Operating expenses:
loss from discontinued operations before provision for income taxes	$ (828,000)	$ (2,749,000)	$ (9,412,000)	$ (12,523,000)
Provision for income taxes	796,000	467,000	1,298,000	992,000
Net loss from discontinued operations net of taxes	48,000	(20,000)	365,000	(394,000)
Photonics
Operating expenses:
Operating Expenses	(48,000)	20,000	(365,000)	394,000
Operating income (loss) – discontinued operations	48,000	(20,000)	365,000	(394,000)
Other income (expense) – discontinued operations	0	0	0	0
loss from discontinued operations before provision for income taxes	48,000	(20,000)	365,000	(394,000)
Provision for income taxes	0	0	0	0
Net loss from discontinued operations net of taxes	48,000	(20,000)	365,000	(394,000)
Photonics | Selling, general and administrative
Operating expenses:
Operating Expenses	$ (48,000)	$ 20,000	$ (365,000)	$ 394,000