GEOGRAPHIC AND CUSTOMER CONCENTRATION INFORMATION - Net Sales by Geographic Area (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 01, 2012	Jul. 03, 2011	Jul. 01, 2012	Jul. 03, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	$ 34,884	$ 51,259	$ 85,388	$ 98,308
Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	100.00%	100.00%	100.00%	100.00%
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	2,074	1,740	12,244	2,823
United States | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	6.00%	3.00%	14.00%	3.00%
Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	18,798	21,388	43,056	43,521
Korea | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	54.00%	42.00%	51.00%	44.00%
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	4,087	14,378	12,030	23,332
Taiwan | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	12.00%	28.00%	14.00%	24.00%
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	2,343	3,643	3,900	10,218
China | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	7.00%	7.00%	5.00%	10.00%
Other Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	3,814	6,420	6,322	10,625
Other Asia | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	11.00%	13.00%	7.00%	11.00%
Europe and others
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	$ 3,768	$ 3,690	$ 7,836	$ 7,789
Europe and others | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	10.00%	7.00%	9.00%	8.00%