Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 30, 2014	Mar. 31, 2013
Net sales	$ 43,198	$ 20,237
Cost of sales	28,552	15,869
Gross profit	14,646	4,368
Operating expenses:
Research, development and engineering	4,524	4,313
Selling, general and administrative	7,421	7,550
Restructuring charges	0	2,258
Total operating expenses	11,945	14,121
Loss from operations	2,701	(9,753)
Interest income (expense), net	(126)	16
Other income (expense), net	79	283
Loss before income taxes	2,654	(9,454)
Provision for (benefit from) income taxes	189	54
Net loss	$ 2,465	$ (9,508)
Net loss per share:
Basic (in dollars per share)	$ 0.04	$ (0.16)
Diluted (in dollars per share)	$ 0.04	$ (0.16)
Shares used in computing net loss per share:
Basic (in shares)	66,275	58,728
Diluted (in shares)	67,971	58,728