Quarterly report pursuant to Section 13 or 15(d)

REVENUE - Revenue by Market (Details)

v3.19.2
REVENUE - Revenue by Market (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Revenue from External Customer [Line Items]        
Net sales $ 23,428 $ 50,910 $ 42,756 $ 103,277
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 $ 1,393 $ 1,855 $ 2,908 $ 3,391
Americas | Sales Revenue, Net | Geographic Concentration Risk        
Revenue from External Customer [Line Items]        
Percentage 5.90% 3.60% 6.80% 3.30%
Hong Kong        
Revenue from External Customer [Line Items]        
Net sales $ 19,524 $ 44,615 $ 34,890 $ 92,234
Hong Kong | Sales Revenue, Net | Geographic Concentration Risk        
Revenue from External Customer [Line Items]        
Percentage 83.30% 87.70% 81.60% 89.30%
China        
Revenue from External Customer [Line Items]        
Net sales $ 557 $ 2,553 $ 1,613 $ 3,812
China | Sales Revenue, Net | Geographic Concentration Risk        
Revenue from External Customer [Line Items]        
Percentage 2.40% 5.00% 3.80% 3.70%
Taiwan        
Revenue from External Customer [Line Items]        
Net sales $ 1,057 $ 937 $ 1,691 $ 1,998
Taiwan | Sales Revenue, Net | Geographic Concentration Risk        
Revenue from External Customer [Line Items]        
Percentage 4.50% 1.80% 3.90% 1.90%
South Korea        
Revenue from External Customer [Line Items]        
Net sales $ 84 $ 140 $ 190 $ 259
South Korea | Sales Revenue, Net | Geographic Concentration Risk        
Revenue from External Customer [Line Items]        
Percentage 0.40% 0.30% 0.40% 0.30%
Japan        
Revenue from External Customer [Line Items]        
Net sales $ 50 $ 44 $ 94 $ 109
Japan | Sales Revenue, Net | Geographic Concentration Risk        
Revenue from External Customer [Line Items]        
Percentage 0.20% 0.10% 0.20% 0.10%
Singapore        
Revenue from External Customer [Line Items]        
Net sales $ 18 $ 51 $ 30 $ 82
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 $ 85 $ 57 $ 119 $ 100
Malaysia | Sales Revenue, Net | Geographic Concentration Risk        
Revenue from External Customer [Line Items]        
Percentage 0.40% 0.10% 0.30% 0.10%
Russia and Kazakhstan        
Revenue from External Customer [Line Items]        
Net sales $ 200 $ 239 $ 418 $ 442
Russia and Kazakhstan | Sales Revenue, Net | Geographic Concentration Risk        
Revenue from External Customer [Line Items]        
Percentage 0.80% 0.50% 1.00% 0.40%
Europe        
Revenue from External Customer [Line Items]        
Net sales $ 331 $ 419 $ 674 $ 850
Europe | Sales Revenue, Net | Geographic Concentration Risk        
Revenue from External Customer [Line Items]        
Percentage 1.40% 0.80% 1.60% 0.80%
India        
Revenue from External Customer [Line Items]        
Net sales $ 129 $ 0 $ 129 $ 0
India | Sales Revenue, Net | Geographic Concentration Risk        
Revenue from External Customer [Line Items]        
Percentage 0.60% 0.00% 0.30% 0.00%