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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES, Advertising Costs (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2019
Dec. 31, 2017
Selling and Marketing Expenses [Member]      
Advertising Costs [Abstract]      
Advertising expense $ 154,000 $ 381,000 $ 210,000
Advertising Expenses [Member]      
Advertising Costs [Abstract]      
Advertising expense $ 1,090,000 $ 2,820,000 $ 1,940,000