Quarterly report pursuant to Section 13 or 15(d)

REVENUE - Revenue by Market (Details)

v3.19.1
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%