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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts receivable and Property, plant and equipment (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
Accounts receivable    
Number of products consigned to customers | item 0  
Allowance for bad debt | $ $ 146 $ 150
Production equipment | Minimum    
Property, plant, and equipment    
Useful lives 3 years  
Production equipment | Maximum    
Property, plant, and equipment    
Useful lives 13 years  
Office furniture, fixtures, and equipment | Minimum    
Property, plant, and equipment    
Useful lives 3 years  
Office furniture, fixtures, and equipment | Maximum    
Property, plant, and equipment    
Useful lives 10 years  
Buildings    
Property, plant, and equipment    
Useful lives 39 years  
Building Improvements    
Property, plant, and equipment    
Useful lives 15 years