Quarterly report pursuant to Section 13 or 15(d)

REVENUE - Revenue by Market (Details)

v3.10.0.1
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%