GEOGRAPHIC AND CUSTOMER CONCENTRATION INFORMATION - Net Sales by Geographic Area (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2014	Mar. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	$ 43,198	$ 20,237
Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	100.00%	100.00%
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	4,183	3,084
United States | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	10.00%	15.00%
South Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	10,259	868
South Korea | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	24.00%	4.00%
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	13,081	1,952
China | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	30.00%	10.00%
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	10,822	12,065
Taiwan | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	25.00%	60.00%
Other Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	2,281	1,066
Other Asia | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	5.00%	5.00%
Europe and others
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	$ 2,572	$ 1,202
Europe and others | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	6.00%	6.00%