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STOCKHOLDERS' EQUITY (Remaining Warrants) (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 20, 2018
Apr. 30, 2018
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2019
May 31, 2019
Apr. 30, 2019
Feb. 28, 2018
Dec. 31, 2017
Class of Stock [Line Items]                    
Class of warrant, number of securities called by warrants     909,189     909,189        
Loss on modification of warrants     $ (1,128,000)     $ (1,128,000)        
Warrants exercised           20,000        
Creditor Warrants Relating to Secured Debt [Member]                    
Class of Stock [Line Items]                    
Class of warrant, number of securities called by warrants                 7,207 7,207
Exercise price (in dollars per share)                 $ 112.50  
April 2018 Warrants                    
Class of Stock [Line Items]                    
Stock rights issued (in shares)   243,224                
Exercise price (in dollars per share)   $ 11.25     $ 7.50          
Warrants, fair value   $ 1,100,000                
Warrants exercised     51,708     51,708        
Proceeds from issuance of warrants     $ 279,000     $ 279,000        
Intrinsic value of warrants exercisable     128,000     128,000        
April 2018 Warrants, First Half                    
Class of Stock [Line Items]                    
Class of warrant or right, term 5 years 5 years                
Amended Warrants                    
Class of Stock [Line Items]                    
Exercise price (in dollars per share)               $ 5.40    
Warrants term               5 years    
Loss on modification of warrants           1,100,000        
Amended April 2018 Warrants                    
Class of Stock [Line Items]                    
Exercise price (in dollars per share)               $ 5.40    
Warrants term               5 years    
Loss on modification of warrants     700,000     700,000        
Amended Q3 2018 Warrants [Member]                    
Class of Stock [Line Items]                    
Loss on modification of warrants     $ 400,000     $ 400,000        
April 2018 Warrants, Second Half                    
Class of Stock [Line Items]                    
Class of warrant or right, term 1 year 1 year                
Warrants term   1 year                
Advisor Warrants                    
Class of Stock [Line Items]                    
Stock rights issued (in shares)   15,466                
Quarter 3 2018 Warrants                    
Class of Stock [Line Items]                    
Stock rights issued (in shares)         196,340          
Exercise price (in dollars per share)               $ 5.40    
Warrants term               5 years    
Warrants exercised     53,610     53,610        
Proceeds from issuance of warrants     $ 289,000     $ 289,000        
Intrinsic value of warrants exercisable     $ 133,382     $ 133,382        
Quarter 3 2018 Warrants | Convertible Debt [Member]                    
Class of Stock [Line Items]                    
Class of warrant, number of securities called by warrants         196,340          
Exercise price (in dollars per share)         $ 11.25          
Warrants, fair value         $ 700,000          
Quarter 3 2018 Warrants, First Half [Member] | Convertible Debt [Member]                    
Class of Stock [Line Items]                    
Class of warrant or right, term         5 years          
Quarter 3 2018 Warrants, Second Half [Member] | Convertible Debt [Member]                    
Class of Stock [Line Items]                    
Class of warrant or right, term         1 year          
Warrants Not Assumed In Merger, Expiring November 2023 [Member]                    
Class of Stock [Line Items]                    
Class of warrant, number of securities called by warrants     75,788     75,788        
Exercise price (in dollars per share)     $ 5.40     $ 5.40        
Warrants Not Assumed In Merger, Expiring December 2023 [Member]                    
Class of Stock [Line Items]                    
Class of warrant, number of securities called by warrants     51,282     51,282        
Exercise price (in dollars per share)     $ 5.40     $ 5.40        
Quarter 4 2018 Warrants                    
Class of Stock [Line Items]                    
Stock rights issued (in shares)       300,115            
Warrants exercised     173,045     173,045        
Proceeds from issuance of warrants     $ 934,000     $ 934,000        
Intrinsic value of warrants exercisable     $ 489,000     $ 489,000        
Quarter 4 2018 Warrants | Convertible Debt [Member]                    
Class of Stock [Line Items]                    
Class of warrant, number of securities called by warrants       300,115            
Exercise price (in dollars per share)       $ 5.40            
Warrants, fair value       $ 700,000            
Warrants term       5 years            
April 2019 Bridge Notes | Convertible Debt [Member]                    
Class of Stock [Line Items]                    
Class of warrant, number of securities called by warrants               147,472    
Exercise price (in dollars per share)               $ 5.40    
Warrants, fair value               $ 1,000,000    
Warrants term               5 years    
May 2019 Warrants | Convertible Debt [Member]                    
Class of Stock [Line Items]                    
Class of warrant, number of securities called by warrants             154,343      
Exercise price (in dollars per share)             $ 5.40      
Warrants, fair value             $ 900,000      
Warrants term             5 years      
2018 Note Agreement                    
Class of Stock [Line Items]                    
Exercise price (in dollars per share)   $ 4.50                
2018 Note Agreement | Advisor Warrants                    
Class of Stock [Line Items]                    
Stock rights issued (in shares)   15,466                
Exercise price (in dollars per share)   $ 11.25                
Warrants, fair value   $ 100,000