GEOGRAPHIC AND CUSTOMER CONCENTRATION INFORMATION - Net Sales by Geographic Area (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Oct. 02, 2011	Sep. 30, 2012	Oct. 02, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	$ 20,398	$ 44,945	$ 105,786	$ 143,253
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	2,034	4,959	14,279	7,782
United States | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	10.00%	11.00%	13.00%	5.00%
Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	3,234	15,507	46,290	59,028
Korea | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	16.00%	35.00%	44.00%	41.00%
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	5,972	8,243	18,002	31,575
Taiwan | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	29.00%	18.00%	17.00%	22.00%
Other Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	7,972	10,235	18,192	31,078
Other Asia | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	39.00%	23.00%	17.00%	22.00%
Europe and others
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	$ 1,186	$ 6,001	$ 9,023	$ 13,790
Europe and others | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	6.00%	13.00%	9.00%	10.00%