GEOGRAPHIC AND CUSTOMER CONCENTRATION INFORMATION - Net Sales by Geographic Area (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	$ 24,574	$ 34,884	$ 44,811	$ 85,388
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	3,252	2,074	6,336	12,244
United States | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	13.00%	6.00%	14.00%	14.00%
Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	1,407	18,798	2,275	43,056
Korea | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	6.00%	54.00%	5.00%	51.00%
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	14,659	4,087	26,724	12,030
Taiwan | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	60.00%	12.00%	60.00%	14.00%
Other Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	4,300	6,157	7,318	10,222
Other Asia | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	17.00%	18.00%	16.00%	12.00%
Europe and others
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	$ 956	$ 3,768	$ 2,158	$ 7,836
Europe and others | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	4.00%	10.00%	5.00%	9.00%