SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts receivable, Property, plant and equipment and Long-lived assets (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($) item	Dec. 31, 2017 USD ($)
Accounts receivable
Number of products consigned to customers | item	0
Allowance for Bad Debt | $	$ 102	$ 102
Production equipment | Minimum
Property, plant, and equipment
Useful lives	3 years
Production equipment | Maximum
Property, plant, and equipment
Useful lives	13 years
Office furniture and equipment | Minimum
Property, plant, and equipment
Useful lives	3 years
Office furniture 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