GEOGRAPHIC AND CUSTOMER CONCENTRATION INFORMATION - Net Sales by Geographic Area (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Apr. 01, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	$ 20,237	$ 50,504
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	3,084	10,170
United States | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	15.00%	20.00%
Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	868	24,258
Korea | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	4.00%	48.00%
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	12,065	7,943
Taiwan | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	60.00%	16.00%
Other Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	3,018	4,064
Other Asia | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	15.00%	8.00%
Europe and others
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	$ 1,202	$ 4,069
Europe and others | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	6.00%	8.00%