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INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Intangible assets, net          
Intangible assets, net $ 8,036   $ 8,036   $ 8,211
Amortization expense 168 $ 163 471 $ 524  
Impairment of intangible assets 0     146  
Intangible assets written off, cost       448  
Intangible assets written off, accumulated amortization       $ 302  
MSA Signatory Costs          
Intangible assets, net          
Indefinite-lived intangible assets 2,202   2,202   2,202
Licensing agreements          
Intangible assets, net          
Indefinite-lived intangible assets 350   350   350
Patent and Trademark [Member]          
Intangible assets, net          
Gross 5,951   5,951   5,667
Less: accumulated amortization (3,207)   (3,207)   (2,936)
Total 2,744   2,744   2,731
Licensing agreements          
Intangible assets, net          
Gross 3,876   3,876   3,876
Less: accumulated amortization (1,136)   (1,136)   (948)
Total $ 2,740   $ 2,740   $ 2,928