GEOGRAPHIC AND CUSTOMER CONCENTRATION INFORMATION - Net Sales by Geographic Area (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2013	Sep. 30, 2012	Sep. 29, 2013	Sep. 30, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	$ 33,840	$ 20,398	$ 78,651	$ 105,786
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	1,045	2,034	7,380	14,279
United States | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	3.00%	10.00%	9.00%	13.00%
Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	9,998	3,234	12,273	46,290
Korea | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	30.00%	16.00%	16.00%	44.00%
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	15,753	5,972	42,477	18,002
Taiwan | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	46.00%	29.00%	54.00%	17.00%
Other Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	4,827	7,972	12,146	18,192
Other Asia | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	14.00%	39.00%	15.00%	17.00%
Europe and others
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, amount	$ 2,217	$ 1,186	$ 4,375	$ 9,023
Europe and others | Geographic Concentration Risk | Net Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, percentage	7.00%	6.00%	6.00%	9.00%