The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Intangible assets, net
Intangible assets, net	$ 8,239		$ 8,239		$ 8,494
Amortization expense	189	$ 223	361	$ 438
Impairment of intangible assets	146		146
Intangible assets written off, cost			448
Intangible assets written off, accumulated amortization			302
Patent and Trademark [Member]
Intangible assets, net
Intangible assets, before impairment	5,512		5,512		5,712
Less: accumulated amortization and impairment	(2,774)		(2,774)		(2,839)
Total	2,738		2,738		2,873
License fee
Intangible assets, net
Gross	3,776		3,776		3,777
Less: accumulated amortization	(827)		(827)		(708)
Total	2,949		2,949		3,069
MSA Signatory Costs
Intangible assets, net
Indefinite-lived intangible assets	2,202		2,202		2,202
License fee
Intangible assets, net
Indefinite-lived intangible assets	$ 350		$ 350		$ 350