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 |