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SEGMENT REPORTING (Schedule of Sales Data by Geographical Area) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SEGMENT REPORTING |  |  |
Net Sales by Segment | $ 115,944 | $ 98,292 | $ 86,512
Net Sales by Segment (as a percent) | 100.00% | 100.00% | 100.00%
China |  |  |
SEGMENT REPORTING |  |  |
Net Sales by Segment | $ 3,146 | $ 2,926 | $ 4,021
Net Sales by Segment (as a percent) | 3.00% | 3.00% | 5.00%
India |  |  |
SEGMENT REPORTING |  |  |
Net Sales by Segment | $ 70,106 | $ 42,352 | $ 33,021
Net Sales by Segment (as a percent) | 60.00% | 43.00% | 38.00%
Japan |  |  |
SEGMENT REPORTING |  |  |
Net Sales by Segment | $ 35,504 | $ 49,185 | $ 45,561
Net Sales by Segment (as a percent) | 31.00% | 50.00% | 52.00%
Taiwan |  |  |
SEGMENT REPORTING |  |  |
Net Sales by Segment | $ 6,445 | $ 3,018 | $ 3,217
Net Sales by Segment (as a percent) | 6.00% | 3.00% | 4.00%
Other |  |  |
SEGMENT REPORTING |  |  |
Net Sales by Segment | $ 743 | $ 811 | $ 692
Net Sales by Segment (as a percent) | 1.00% | 1.00% | 1.00%

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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