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ORGANIZATION AND DESCRIPTION OF BUSINESS (Liquidity and Capital Resources) (Details) - USD ($)
6 Months Ended
Aug. 12, 2019
Jun. 30, 2019
Aug. 06, 2019
Dec. 31, 2018
Subsidiary, Sale of Stock [Line Items]        
Accumulated deficit   $ 107,199,000   $ 92,564,000
Cash, cash equivalents, and investments   10,500,000    
Substantial doubt about going concern, management's evaluation, cash used in the period   (12,100,000)    
Shelf registration statement maximum aggregate proceeds   $ 50,000,000.0    
New shares issued (in shares)   0    
Forecast        
Subsidiary, Sale of Stock [Line Items]        
Consideration received $ 3,000,000      
Subsequent Event | Private Placement        
Subsidiary, Sale of Stock [Line Items]        
Common stock subscriptions, amount     $ 10,000,000