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SEGMENT REPORTING (Schedule of Sales Data by Geographical Area) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
SEGMENT REPORTING      
Net Sales by Segment $ 86,512 $ 117,103 $ 129,420
Net Sales by Segment (as a percent) 100.00% 100.00% 100.00%
China      
SEGMENT REPORTING      
Net Sales by Segment $ 4,021 $ 9,490 $ 15,465
Net Sales by Segment (as a percent) 5.00% 8.00% 12.00%
JAPAN [Member]      
SEGMENT REPORTING      
Net Sales by Segment $ 45,561 $ 57,483 $ 58,999
Net Sales by Segment (as a percent) 52.00% 49.00% 46.00%
India      
SEGMENT REPORTING      
Net Sales by Segment $ 33,021 $ 34,836 $ 37,424
Net Sales by Segment (as a percent) 38.00% 30.00% 29.00%
TAIWAN [Member]      
SEGMENT REPORTING      
Net Sales by Segment $ 3,217 $ 7,904 $ 6,706
Net Sales by Segment (as a percent) 4.00% 7.00% 5.00%
Other      
SEGMENT REPORTING      
Net Sales by Segment $ 692 $ 7,390 $ 10,826
Net Sales by Segment (as a percent) 1.00% 6.00% 8.00%