Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012
Net sales	$ 24,574	$ 34,884	$ 44,811	$ 85,388
Cost of sales	16,107	21,629	31,976	55,199
Gross profit	8,467	13,255	12,835	30,189
Operating expenses:
Research, development and engineering	4,170	5,791	8,483	12,421
Selling, general and administrative	6,952	9,705	14,502	20,572
Restructuring charges	404	831	2,662	1,551
Total operating expenses	11,526	16,327	25,647	34,544
Loss from operations	(3,059)	(3,072)	(12,812)	(4,355)
Interest income (expense), net	(137)	39	(121)	70
Other income (expense), net	(359)	(277)	(76)	105
Loss before income taxes	(3,555)	(3,310)	(13,009)	(4,180)
Provision for (benefit from) income taxes	12	36	66	285
Net loss	$ (3,567)	$ (3,346)	$ (13,075)	$ (4,465)
Net loss per share:
Basic and diluted (in usd per share)	$ (0.06)	$ (0.06)	$ (0.22)	$ (0.08)
Shares used in computing net loss per share:
Basic and Diluted (in shares)	58,891	58,507	58,810	58,463