Annual report pursuant to Section 13 and 15(d)

CONCENTRATIONS OF REVENUES AND CREDIT RISK (Details)

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CONCENTRATIONS OF REVENUES AND CREDIT RISK (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Concentration Risk [Line Items]      
Accounts receivable $ 27,112,000 $ 25,779,000  
Amount owed to supplier for feedstock purchases 4,700,000 $ 8,500,000  
FDIC insured amount $ 250,000    
Supplier Concentration Risk      
Concentration Risk [Line Items]      
Concentration risk 100.00% 100.00% 99.00%
Revenue | Customer Concentration Risk      
Concentration Risk [Line Items]      
Concentration risk 17.00% 19.60% 20.10%
Revenue | Geographic Concentration Risk      
Concentration Risk [Line Items]      
Concentration risk 35.40% 20.80% 23.50%
Accounts Receivable      
Concentration Risk [Line Items]      
Accounts receivable $ 11,000,000 $ 5,800,000