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REVENUE - Revenue by Market (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Revenue from External Customer [Line Items] |  |  |  |
Net sales | $ 47,043 | $ 40,132 | $ 150,320 | $ 151,471
Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Percentage | 100.00% | 100.00% | 100.00% | 100.00%
Americas |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales | $ 1,970 | $ 1,239 | $ 5,361 | $ 4,340
Americas | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Percentage | 4.20% | 3.10% | 3.60% | 2.90%
Hong Kong |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales | $ 41,447 | $ 35,049 | $ 133,681 | $ 135,304
Hong Kong | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Percentage | 88.10% | 87.30% | 88.90% | 89.30%
China |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales | $ 1,698 | $ 1,731 | $ 5,510 | $ 4,732
China | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Percentage | 3.60% | 4.30% | 3.70% | 3.10%
Taiwan |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales | $ 935 | $ 1,229 | $ 2,933 | $ 4,116
Taiwan | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Percentage | 2.00% | 3.10% | 1.90% | 2.70%
South Korea |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales | $ 133 | $ 128 | $ 392 | $ 379
South Korea | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Percentage | 0.30% | 0.30% | 0.30% | 0.30%
Japan |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales | $ 51 | $ 29 | $ 160 | $ 89
Japan | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Percentage | 0.10% | 0.10% | 0.10% | 0.10%
Singapore |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales | $ 52 | $ 40 | $ 134 | $ 124
Singapore | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Percentage | 0.10% | 0.10% | 0.10% | 0.10%
Malaysia |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales | $ 216 | $ 0 | $ 316 | $ 0
Malaysia | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Percentage | 0.50% | 0.00% | 0.20% | 0.00%
Russia and Kazakhstan |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales | $ 184 | $ 209 | $ 626 | $ 655
Russia and Kazakhstan | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Percentage | 0.40% | 0.50% | 0.40% | 0.40%
Europe |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales | $ 357 | $ 478 | $ 1,207 | $ 1,732
Europe | Sales Revenue, Net | Geographic Concentration Risk |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Percentage | 0.70% | 1.20% | 0.80% | 1.10%

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