GEOGRAPHIC AND CUSTOMER CONCENTRATION INFORMATION - Summary of Net Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 27, 2016	Mar. 29, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	$ 28,689	$ 58,254
Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	100.08%	100.00%
Reportable Geographical Components | United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	$ 3,247	$ 8,568
Reportable Geographical Components | United States | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	11.00%	15.00%
Reportable Geographical Components | South Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	$ 6,430	$ 33,998
Reportable Geographical Components | South Korea | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	22.00%	58.00%
Reportable Geographical Components | China
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	$ 11,395	$ 3,599
Reportable Geographical Components | China | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	40.00%	6.00%
Reportable Geographical Components | Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	$ 2,509	$ 5,520
Reportable Geographical Components | Taiwan | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	9.00%	10.00%
Reportable Geographical Components | Other Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	$ 4,137	$ 5,365
Reportable Geographical Components | Other Asia | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	15.00%	9.00%
Reportable Geographical Components | Europe and others
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	$ 971	$ 1,204
Reportable Geographical Components | Europe and others | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	3.00%	2.00%