Quarterly report pursuant to Section 13 or 15(d)

REVENUE - Revenue by Market (Details)

v3.19.3
REVENUE - Revenue by Market (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Revenue from External Customer [Line Items]        
Net sales $ 17,023 $ 47,043 $ 59,779 $ 150,320
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 $ 1,445 $ 1,970 $ 4,353 $ 5,361
Americas | Sales Revenue, Net | Geographic Concentration Risk        
Revenue from External Customer [Line Items]        
Percentage 8.50% 4.20% 7.30% 3.60%
Hong Kong        
Revenue from External Customer [Line Items]        
Net sales $ 13,575 $ 41,447 $ 48,465 $ 133,681
Hong Kong | Sales Revenue, Net | Geographic Concentration Risk        
Revenue from External Customer [Line Items]        
Percentage 79.70% 88.10% 81.00% 88.90%
China        
Revenue from External Customer [Line Items]        
Net sales $ 525 $ 1,698 $ 2,138 $ 5,510
China | Sales Revenue, Net | Geographic Concentration Risk        
Revenue from External Customer [Line Items]        
Percentage 3.10% 3.60% 3.60% 3.70%
Taiwan        
Revenue from External Customer [Line Items]        
Net sales $ 649 $ 935 $ 2,340 $ 2,933
Taiwan | Sales Revenue, Net | Geographic Concentration Risk        
Revenue from External Customer [Line Items]        
Percentage 3.80% 2.00% 3.90% 1.90%
South Korea        
Revenue from External Customer [Line Items]        
Net sales $ 98 $ 133 $ 288 $ 392
South Korea | Sales Revenue, Net | Geographic Concentration Risk        
Revenue from External Customer [Line Items]        
Percentage 0.60% 0.30% 0.50% 0.30%
Japan        
Revenue from External Customer [Line Items]        
Net sales $ 47 $ 51 $ 141 $ 160
Japan | Sales Revenue, Net | Geographic Concentration Risk        
Revenue from External Customer [Line Items]        
Percentage 0.30% 0.10% 0.20% 0.10%
Singapore        
Revenue from External Customer [Line Items]        
Net sales $ 13 $ 52 $ 43 $ 134
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 $ 51 $ 216 $ 170 $ 316
Malaysia | Sales Revenue, Net | Geographic Concentration Risk        
Revenue from External Customer [Line Items]        
Percentage 0.30% 0.50% 0.30% 0.20%
Russia and Kazakhstan        
Revenue from External Customer [Line Items]        
Net sales $ 244 $ 184 $ 662 $ 626
Russia and Kazakhstan | Sales Revenue, Net | Geographic Concentration Risk        
Revenue from External Customer [Line Items]        
Percentage 1.40% 0.40% 1.10% 0.40%
Europe        
Revenue from External Customer [Line Items]        
Net sales $ 343 $ 357 $ 1,017 $ 1,207
Europe | Sales Revenue, Net | Geographic Concentration Risk        
Revenue from External Customer [Line Items]        
Percentage 2.00% 0.70% 1.70% 0.80%
India        
Revenue from External Customer [Line Items]        
Net sales $ 33 $ 0 $ 162 $ 0
India | Sales Revenue, Net | Geographic Concentration Risk        
Revenue from External Customer [Line Items]        
Percentage 0.20% 0.00% 0.30% 0.00%