Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2014	Jun. 30, 2013	Jun. 29, 2014	Jun. 30, 2013
Net revenue	$ 42,029	$ 24,574	$ 85,227	$ 44,811
Cost of goods sold	28,733	16,107	57,285	31,976
Gross margin	13,296	8,467	27,942	12,835
Operating expenses:
Research, development and engineering	4,446	4,170	8,970	8,483
Selling, general and administrative	6,690	6,952	14,111	14,502
Restructuring and other charges	111	404	111	2,662
Total operating expenses	11,247	11,526	23,192	25,647
Income (loss) from operations	2,049	(3,059)	4,750	(12,812)
Interest income (expense), net	(21)	(137)	(147)	(121)
Other income (expense), net	(142)	(359)	(63)	(76)
Income (loss) before income taxes	1,886	(3,555)	4,540	(13,009)
Provision for (benefit from) income taxes	(30)	12	159	66
Net income (loss)	$ 1,916	$ (3,567)	$ 4,381	$ (13,075)
Net income (loss) per share:
Basic (in dollars per share)	$ 0.03	$ (0.06)	$ 0.06	$ (0.22)
Diluted (in dollars per share)	$ 0.03	$ (0.06)	$ 0.06	$ (0.22)
Shares used in computing net income (loss) per share:
Basic (in shares)	73,532	58,891	69,943	58,810
Diluted (in shares)	74,679	58,891	71,405	58,810