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The Company - Schedule of Concentration of Accounts Receivable (Details) (10-K) - Accounts Receivable [Member]
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Customer A [Member]      
Concentration risk, percentage 34.00% 58.00% 21.00%
Customer B [Member]      
Concentration risk, percentage 31.00% 23.00% 15.00%