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PROPERTY AND EQUIPMENT (Schedule of Equipment) (Details) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 3,836,456 $ 2,846,862 $ 2,042,609
Less: Accumulated depreciation 1,484,510 1,046,093 865,860
Property and equipment, net 2,351,946 1,800,769 1,176,749
Office equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 84,751 79,886 82,453
Lab equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 3,489,176 2,513,459 1,695,604
Furniture [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 33,128 33,128 32,693
Leasehold improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 229,401 $ 220,389 $ 231,859