Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013
Net revenue	$ 38,430	$ 33,840	$ 123,657	$ 78,651
Cost of goods sold	25,432	22,416	82,717	54,392
Gross margin	12,998	11,424	40,940	24,259
Operating expenses:
Research, development and engineering	4,849	4,082	13,819	12,565
Selling, general and administrative	7,302	6,572	21,413	21,074
Restructuring and other charges	301	1,000	412	3,662
Total operating expenses	12,452	11,654	35,644	37,301
Income (loss) from operations	546	(230)	5,296	(13,042)
Interest income (expense), net	(47)	(163)	(194)	(284)
Other income (expense), net	148	(35)	85	(111)
Income (loss) before income taxes	647	(428)	5,187	(13,437)
Provision for (benefit from) income taxes	110	(16)	269	50
Net income (loss)	$ 537	$ (412)	$ 4,918	$ (13,487)
Net income (loss) per share:
Basic (in dollars per share)	$ 0.01	$ (0.01)	$ 0.07	$ (0.23)
Diluted (in dollars per share)	$ 0.01	$ (0.01)	$ 0.07	$ (0.23)
Shares used in computing net income (loss) per share:
Basic (in shares)	73,731	59,024	71,215	58,881
Diluted (in shares)	75,023	59,024	72,637	58,881