Schedule of Revenue by Geographical Area (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	[1]	$ 4,973	$ 6,836	$ 11,132	$ 18,000
Asia pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	[2]	3,482	4,511	7,290	13,839
North america
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	[3]	1,087	973	2,929	2,073
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue		404	1,352	913	2,088
Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue		$ 2,100	$ 2,700	$ 4,500	$ 10,400
Revenue percentage		42.00%	39.00%	40.00%	58.00%
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue		$ 1,000	$ 891	$ 2,800	$ 2,000
Revenue percentage		20.00%	13.00%	25.00%	11.00%

[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.

[2] Asia Pacific includes revenue from South Korea of $2.1 million, or 42%, of total revenue and $2.7 million, or 39%, of total revenue for the quarters ended June 28, 2015 and June 29, 2014, respectively.

[3] North America includes revenue from the United States of $1.0 million, or 20%, of total revenue and $891,000, or 13%, for the quarters ended June 28, 2015 and June 29, 2014, respectively.