Condensed Unaudited Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014
Income Statement [Abstract]
Revenue	[1]	$ 4,973	$ 6,836	$ 11,132	$ 18,000
Cost of revenue		2,830	3,820	6,110	10,926
Gross profit		2,143	3,016	5,022	7,074
Operating expenses:
Research and development		3,493	3,056	6,970	5,697
Selling, general and administrative		2,690	2,848	5,650	6,313
Restructuring costs		169	0	169	0
Total operating expenses		6,352	5,904	12,789	12,010
Loss from operations		(4,209)	(2,888)	(7,767)	(4,936)
Interest expense		(15)	(17)	(29)	(33)
Interest income and other expense, net		(33)	(36)	(59)	(62)
Loss before income taxes		(4,257)	(2,941)	(7,855)	(5,031)
Provision for (benefit from) income taxes		21	(44)	61	(24)
Net loss		$ (4,278)	$ (2,897)	$ (7,916)	$ (5,007)
Net loss per share: (in dollars per share)
Basic		$ (0.08)	$ (0.05)	$ (0.14)	$ (0.09)
Diluted		$ (0.08)	$ (0.05)	$ (0.14)	$ (0.09)
Weighted average shares: (in shares)
Basic		56,359	55,379	56,275	54,906
Diluted		56,359	55,379	56,275	54,906

[1] For all periods presented: New products include all products manufactured on 180 nanometer or smaller semiconductor processes. Mature products include all products produced on semiconductor processes larger than 180 nanometers.