Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Net sales	$ 269,654	$ 316,629	$ 214,511
Cost and expenses:
Cost of sales	180,616	210,657	157,111
Research and development	33,107	36,018	40,450
Selling, general and administrative	51,170	$ 50,551	$ 47,925
Gain on sale of facility (Note 3)	(3,198)
Cost and expenses	261,695	$ 297,226	$ 245,486
Income (loss) from operations	7,959	19,403	(30,975)
Interest income	44	30	54
Total	8,003	19,433	(30,921)
Income tax provision (benefit)	2,211	4,653	(2,373)
Income (loss) from continuing operations	5,792	14,780	(28,548)
Loss from discontinued operations, net of tax (Note 2)	(5,542)	(6,072)	(4,870)
Net income (loss)	$ 250	$ 8,708	$ (33,418)
Basic:
Income (loss) from continuing operations (in dollars per share)	$ 0.22	$ 0.58	$ (1.15)
Loss from discontinued operations (in dollars per share)	(0.21)	(0.24)	(0.19)
Net income (loss) (in dollars per share)	0.01	0.34	(1.34)
Diluted:
Income (loss) from continuing operations (in dollars per share)	0.22	0.57	(1.15)
Loss from discontinued operations (in dollars per share)	(0.21)	(0.24)	(0.19)
Net income (loss) (in dollars per share)	$ 0.01	$ 0.33	$ (1.34)
Weighted average shares used in computing income (loss) per share:
Basic (in shares)	26,057	25,393	24,859
Diluted (in shares)	26,788	26,006	24,859