The Company and Basis of Presentation (Details) (USD $)							3 Months Ended	9 Months Ended
	Sep. 28, 2014	Dec. 29, 2013	Sep. 29, 2013	Dec. 30, 2012	Sep. 28, 2014 Revolving Credit Facility [Member] Silicon Valley Bank [Member]	Jun. 30, 2014 Revolving Credit Facility [Member] Silicon Valley Bank [Member]	Sep. 28, 2014 Samsung [Member]	Sep. 28, 2014 Samsung [Member]
Liquidity [Line Items]
Cash and cash equivalents	$ 31,159,000	$ 37,406,000	$ 14,871,000	$ 22,578,000
Line of credit facility, additional borrowing capacity					5,000,000
Maximum borrowing capacity						6,000,000
Additional borrowing capacity						$ 10,000,000
Percentage of revenue from major customer							27.00%	53.00%