Schedule of Revenue by Product Line (Details) $ in Thousands		3 Months Ended			6 Months Ended
		Jun. 28, 2015 USD ($) segment		Jun. 29, 2014 USD ($) segment	Jun. 28, 2015 USD ($)	Jun. 29, 2014 USD ($)
Revenue from External Customer [Line Items]
Number of reportable segments | segment		1		1
Total revenue	[1]	$ 4,973		$ 6,836	$ 11,132	$ 18,000
New products
Revenue from External Customer [Line Items]
Total revenue		2,953	[1]	4,482	7,097	13,398
Mature products
Revenue from External Customer [Line Items]
Total revenue		$ 2,020	[1]	$ 2,354	$ 4,035	$ 4,602

[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.