CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
	Jan. 02, 2021	Jan. 01, 2022
Net revenues:
Total net revenues	$ 52,128	$ 38,524
Cost of net revenues:
Total cost of net revenues	29,711	31,457
Gross profit	22,417	7,067
Operating expenses:
Research and development	13,205	12,176
Selling, general and administrative	18,092	17,367
Total operating expenses	31,297	29,543
Operating loss	(8,880)	(22,476)
Interest income	284	29
Other income (expense), net	(128)	(35)
Loss from continuing operations before provision for income taxes	(8,724)	(22,482)
Provision for income taxes	1,711	575
Net loss from continuing operations	(10,435)	(23,057)
Income from discontinued operations:
Income (loss) from Photonics division, net of tax	11,491	(4,664)
Gain on sale of Photonics division, net of tax	0	54,341
Total income from discontinued operations, net of tax	11,491	49,677
Net income	$ 1,056	$ 26,620
Net income (loss) per share:
Basic and diluted—continuing operations	$ (0.44)	$ (0.95)
Basic and diluted—discontinued operations	0.49	2.04
Basic and diluted—net income	$ 0.04	$ 1.09
Weighted average shares outstanding:
Basic and diluted	23,669	24,348