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SEGMENT REPORTING (Schedule of Sales Data by Geographical Area) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
SEGMENT REPORTING
Net Sales by Segment	$ 98,292	$ 86,512	$ 117,103
Net Sales by Segment (as a percent)	100.00%	100.00%	100.00%
China
SEGMENT REPORTING
Net Sales by Segment	$ 2,926	$ 4,021	$ 9,490
Net Sales by Segment (as a percent)	3.00%	5.00%	8.00%
Japan
SEGMENT REPORTING
Net Sales by Segment	$ 49,185	$ 45,561	$ 57,483
Net Sales by Segment (as a percent)	50.00%	52.00%	49.00%
India
SEGMENT REPORTING
Net Sales by Segment	$ 42,352	$ 33,021	$ 34,836
Net Sales by Segment (as a percent)	43.00%	38.00%	30.00%
Taiwan
SEGMENT REPORTING
Net Sales by Segment	$ 3,018	$ 3,217	$ 7,904
Net Sales by Segment (as a percent)	3.00%	4.00%	7.00%
Other
SEGMENT REPORTING
Net Sales by Segment	$ 811	$ 692	$ 7,390
Net Sales by Segment (as a percent)	1.00%	1.00%	6.00%

X

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Represents the net sales, expressed as a percentage of net sales revenue.

+ References

No definition available.

+ Details

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- Details

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