Annual report pursuant to Section 13 and 15(d)

NATURE OF OPERATIONS AND ACCOUNTING POLICIES - Concentrations of Credit Risk Narrative (Details)

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NATURE OF OPERATIONS AND ACCOUNTING POLICIES - Concentrations of Credit Risk Narrative (Details)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Accounts Receivable | Customer Concentration Risk    
Concentration Risk [Line Items]    
Percentage of net trade receivables 52.00% 46.00%