Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 25, 2010	Dec. 26, 2009
Consolidated Statements of Operations [Abstract]
Net sales	$ 308,968	$ 322,667	$ 171,261
Cost and expenses:
Cost of sales	208,839	212,672	118,873
Research and development	36,230	36,201	31,964
Selling, general and administrative	46,563	44,117	35,519
Total cost and expenses	291,632	292,990	186,356
Income (loss) from operations	17,336	29,677	(15,095)
Interest and other income	442	561	1,300
Income (loss) before income taxes	17,778	30,238	(13,795)
Income tax provision	2,059	5,594	14,373
Net income (loss)	$ 15,719	$ 24,644	$ (28,168)
Income (loss) per share:
Basic	$ 0.65	$ 1.04	$ (1.20)
Diluted	$ 0.64	$ 1.02	$ (1.20)
Weighted average shares used in computing income (loss) per share:
Basic	24,134	23,732	23,412
Diluted	24,501	24,097	23,412