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CONVERTIBLE NOTES - Bridge Notes (Details)
1 Months Ended 3 Months Ended
May 14, 2019
USD ($)
D
$ / shares
shares
Apr. 16, 2019
USD ($)
D
$ / shares
shares
Apr. 30, 2018
$ / shares
shares
Mar. 31, 2020
USD ($)
$ / shares
shares
Mar. 31, 2019
USD ($)
$ / shares
shares
Feb. 29, 2020
$ / shares
Dec. 31, 2019
USD ($)
May 31, 2019
$ / shares
Apr. 30, 2019
$ / shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Apr. 20, 2018
USD ($)
Aug. 31, 2017
$ / shares
Debt Instrument [Line Items]                        
Proceeds from issuance of debt         $ 250,000              
Total debt       $ 374,000     $ 519,000          
Warrant revaluation       (936,000) (240,000)              
Loss on extinguishment of convertible notes       (1,225,000)                
Proceeds from convertible notes         250,000              
Derivative asset (liability)                   $ 62,000    
Loss on extinguishment of debt       (1,225,000)                
Conversion of interest on convertible debt into common stock       $ 325,000 2,933,000              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares       907,601                
Wrote-off of debt discount with an offset to additional paid in capital       $ 63,000 (315,000)              
Write-off debt derivative liability in conjunction with convertible note conversions         39,000              
Long-term debt, net of current maturities       $ 194,000     198,000          
Gain (Loss) on Derivative Instruments Held for Trading Purposes, Net         $ 23,000              
Bridge Notes Redemption Feature [Member]                        
Debt Instrument [Line Items]                        
Derivative asset (liability)                   $ 30,000    
Convertible Promissory Note Warrants                        
Debt Instrument [Line Items]                        
Exercise price (in dollars per share) | $ / shares                       $ 45.00
Convertible Promissory Note Warrants | Maximum                        
Debt Instrument [Line Items]                        
Exercise price (in dollars per share) | $ / shares       $ 0.40   $ 2.25            
April 2018 Warrants, First Half                        
Debt Instrument [Line Items]                        
Class of Warrant or Right, Term     5 years                  
April 2018 Warrants, Second Half                        
Debt Instrument [Line Items]                        
Class of Warrant or Right, Term     1 year                  
April 2018 Warrants                        
Debt Instrument [Line Items]                        
Stock rights issued (in shares) | shares | shares     243,224                  
Exercise price (in dollars per share) | $ / shares     $ 11.25                  
Quarter 3 2018 Warrants                        
Debt Instrument [Line Items]                        
Exercise price (in dollars per share) | $ / shares                 $ 5.40      
Warrants term                 5 years      
2018 Note Agreement                        
Debt Instrument [Line Items]                        
Debt instrument, face amount                     $ 4,500,000  
2018 Note Agreement | Advisor Warrants                        
Debt Instrument [Line Items]                        
Stock rights issued (in shares) | shares | shares     15,466                  
Exercise price (in dollars per share) | $ / shares     $ 11.25                  
May 2019 Bridge Notes                        
Debt Instrument [Line Items]                        
Stock rights issued (in shares) | shares | shares 154,343                      
Warrants, fair value $ 900,000                      
Exercise price (in dollars per share) | $ / shares $ 9.56                      
Warrants term 5 years                      
Convertible Debt [Member]                        
Debt Instrument [Line Items]                        
Debt, carrying amount       $ 2,292,000     142,000          
Long-term debt, net of current maturities       0     0          
Convertible Debt [Member] | Quarter 3 2018 Warrants                        
Debt Instrument [Line Items]                        
Exercise price (in dollars per share) | $ / shares         $ 11.25              
Convertible Debt [Member] | Quarter 4 2018 Warrants                        
Debt Instrument [Line Items]                        
Exercise price (in dollars per share) | $ / shares                   $ 5.40    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares                   300,115    
Warrants term                   5 years    
Convertible Debt [Member] | April 2019 Bridge Notes And May 2019 Bridge Notes | Amendment Agreement                        
Debt Instrument [Line Items]                        
Debt discount       1,000,000                
Beneficial conversion feature       500,000                
Loss on extinguishment of convertible notes       1,200,000                
Convertible Debt, Fair Value Disclosures       2,600,000                
Floor price | $ / shares               $ 2.25 $ 0.40      
Fair value of convertible debt       2,600,000                
Debt premium on debt       800,000                
Loss on extinguishment of debt       1,200,000                
Beneficial conversion       500,000                
Debt Instrument, Unamortized Premium       800,000                
Convertible Debt [Member] | April 2019 Bridge Notes And May 2019 Bridge Notes | Amendment Agreement | Bridge Notes Beneficial Conversion Features                        
Debt Instrument [Line Items]                        
Convertible Debt, Fair Value Disclosures       0                
Fair value of convertible debt       0                
Convertible Debt [Member] | April 2019 Bridge Notes And May 2019 Bridge Notes | Amendment Agreement | Bridge Notes Redemption Feature [Member]                        
Debt Instrument [Line Items]                        
Convertible Debt, Fair Value Disclosures       0                
Fair value of convertible debt       0                
Convertible Debt [Member] | Convertible Bridge Loan                        
Debt Instrument [Line Items]                        
Debt discount         $ 1,053,000   $ 1,796,000     $ 1,111,000    
Debt premium on debt       679,000 91,000         647,000    
Debt Instrument, Unamortized Premium       679,000 91,000         $ 647,000    
Amortization of debt discount       703,000 58,000              
Amortization of debt premium       $ 39,000 $ 160,000              
Convertible Debt [Member] | April 2019 Bridge Notes                        
Debt Instrument [Line Items]                        
Discount percentage   9.00%                    
Proceeds from issuance of debt   $ 900,000                    
Total debt   989,011                    
Debt discount   $ 89,000                    
Stock rights issued (in shares) | shares | shares   147,472                    
Warrants, fair value   $ 1,000,000                    
Exercise price (in dollars per share) | $ / shares   $ 5.40                    
Beneficial conversion feature   $ 900,000                    
Proceeds from convertible notes   900,000                    
Beneficial conversion   $ 900,000                    
Warrants term   5 years                    
Convertible Debt [Member] | April 2019 Bridge Notes | Amendment Agreement                        
Debt Instrument [Line Items]                        
Conversion threshold percentage of stock price trigger   80.00%                    
Convertible debt, threshold consecutive trading days | D   10                    
Conversion price per share | $ / shares   $ 0.75                    
Floor price | $ / shares   2.25                    
Convertible Debt [Member] | April 2019 Bridge Notes | Maximum | Amendment Agreement                        
Debt Instrument [Line Items]                        
Conversion price per share | $ / shares   $ 3.75                    
Convertible Debt [Member] | May 2019 Bridge Notes                        
Debt Instrument [Line Items]                        
Debt instrument, face amount $ 1,098,901                      
Conversion threshold percentage of stock price trigger 80.00%                      
Convertible debt, threshold consecutive trading days | D 10                      
Conversion price per share | $ / shares $ 7.12                      
Repayment Period 180 days                      
Proceeds from issuance of debt $ 1,000,000                      
Debt discount 99,000                      
Beneficial conversion feature $ 900,000                      
Original issue discount (as a percent) 9                      
Proceeds from convertible notes $ 1,000,000                      
Floor price | $ / shares $ 2.25                      
Beneficial conversion $ 900,000                      
Convertible Debt [Member] | Quarter 4 2018 Bridge Notes                        
Debt Instrument [Line Items]                        
Number of shares converted from debt instrument (in shares) | shares       427,997 1,019,430              
Conversion of interest on convertible debt into common stock       $ 300,000 $ 2,100,000