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REVENUE - Revenue by Market (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Revenue from External Customer [Line Items] |  |
Net sales | $ 19,328 | $ 52,367
Sales Revenue, Net | Geographic Concentration Risk |  |
Revenue from External Customer [Line Items] |  |
Percentage | 100.00% | 100.00%
Americas |  |
Revenue from External Customer [Line Items] |  |
Net sales | $ 1,515 | $ 1,536
Americas | Sales Revenue, Net | Geographic Concentration Risk |  |
Revenue from External Customer [Line Items] |  |
Percentage | 7.80% | 2.90%
Hong Kong |  |
Revenue from External Customer [Line Items] |  |
Net sales | $ 15,366 | $ 47,619
Hong Kong | Sales Revenue, Net | Geographic Concentration Risk |  |
Revenue from External Customer [Line Items] |  |
Percentage | 79.50% | 91.00%
China |  |
Revenue from External Customer [Line Items] |  |
Net sales | $ 1,056 | $ 1,259
China | Sales Revenue, Net | Geographic Concentration Risk |  |
Revenue from External Customer [Line Items] |  |
Percentage | 5.50% | 2.40%
Taiwan |  |
Revenue from External Customer [Line Items] |  |
Net sales | $ 634 | $ 1,061
Taiwan | Sales Revenue, Net | Geographic Concentration Risk |  |
Revenue from External Customer [Line Items] |  |
Percentage | 3.30% | 2.00%
South Korea |  |
Revenue from External Customer [Line Items] |  |
Net sales | $ 106 | $ 119
South Korea | Sales Revenue, Net | Geographic Concentration Risk |  |
Revenue from External Customer [Line Items] |  |
Percentage | 0.50% | 0.20%
Japan |  |
Revenue from External Customer [Line Items] |  |
Net sales | $ 44 | $ 65
Japan | Sales Revenue, Net | Geographic Concentration Risk |  |
Revenue from External Customer [Line Items] |  |
Percentage | 0.20% | 0.10%
Singapore |  |
Revenue from External Customer [Line Items] |  |
Net sales | $ 12 | $ 31
Singapore | Sales Revenue, Net | Geographic Concentration Risk |  |
Revenue from External Customer [Line Items] |  |
Percentage | 0.10% | 0.10%
Malaysia |  |
Revenue from External Customer [Line Items] |  |
Net sales | $ 34 | $ 43
Malaysia | Sales Revenue, Net | Geographic Concentration Risk |  |
Revenue from External Customer [Line Items] |  |
Percentage | 0.20% | 0.10%
Russia and Kazakhstan |  |
Revenue from External Customer [Line Items] |  |
Net sales | $ 218 | $ 203
Russia and Kazakhstan | Sales Revenue, Net | Geographic Concentration Risk |  |
Revenue from External Customer [Line Items] |  |
Percentage | 1.10% | 0.40%
Europe |  |
Revenue from External Customer [Line Items] |  |
Net sales | $ 343 | $ 431
Europe | Sales Revenue, Net | Geographic Concentration Risk |  |
Revenue from External Customer [Line Items] |  |
Percentage | 1.80% | 0.80%

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