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CONVERTIBLE NOTES - Bridge Notes (Details)
1 Months Ended 3 Months Ended 6 Months Ended
May 14, 2019
USD ($)
D
$ / shares
shares
Apr. 16, 2019
USD ($)
D
$ / shares
shares
Feb. 12, 2019
USD ($)
shares
Nov. 29, 2018
USD ($)
shares
Sep. 17, 2018
USD ($)
Apr. 20, 2018
USD ($)
Apr. 30, 2018
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
$ / shares
shares
Sep. 30, 2018
USD ($)
item
$ / shares
shares
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
Apr. 30, 2019
$ / shares
Jan. 02, 2019
Aug. 31, 2017
$ / shares
Debt Instrument [Line Items]                                  
Interest rate (as a percent)                               8.00%  
Proceeds from issuance of debt                         $ 2,150,000 $ 1,660,000      
Total debt               $ 326,000   $ 516,000     326,000        
Warrant revaluation and modification                         582,000 (584,000)      
Derivative liability from debt discount               400,000         400,000        
Loss on modification of warrants               $ (1,128,000)         (1,128,000)        
Proceeds from convertible notes                         $ 2,150,000 1,660,000      
Derivative asset (liability)                   62,000   $ 143,000   143,000      
Warrant liability canceled due to settlement of equity instruments                           456,000      
Number of shares converted from debt instrument (in shares) | shares     120,983                            
Conversion of convertible debt plus interest into common stock     $ 1,900,000                            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares               909,189         909,189        
Wrote-off of debt discount with an offset to additional paid in capital               $ 842,000 $ (315,000)                
Write-off debt derivative liability in conjunction with convertible note conversions                 39,000     438,000          
Long-term debt, net of current maturities               223,000   253,000     $ 223,000        
Gain (Loss) on Derivative Instruments Held for Trading Purposes, Net               $ (438,000)       (1,000) (415,000) (1,000)      
Bridge Notes Redemption Feature [Member]                                  
Debt Instrument [Line Items]                                  
Derivative asset (liability)                   $ 30,000   143,000   143,000      
Maximum                                  
Debt Instrument [Line Items]                                  
Write-off debt derivative liability in conjunction with convertible note conversions                         $ 100,000        
Convertible Promissory Note Warrants                                  
Debt Instrument [Line Items]                                  
Exercise price (in dollars per share) | $ / shares               $ 21.00         $ 21.00       $ 45.00
April 2018 Warrants, First Half                                  
Debt Instrument [Line Items]                                  
Class of Warrant or Right, Term           5 years 5 years                    
April 2018 Warrants, Second Half                                  
Debt Instrument [Line Items]                                  
Class of Warrant or Right, Term           1 year 1 year                    
Warrants term             1 year                    
April 2018 Warrants                                  
Debt Instrument [Line Items]                                  
Stock rights issued (in shares) | shares | shares             243,224                    
Warrants, fair value             $ 1,100,000                    
Exercise price (in dollars per share) | $ / shares             $ 11.25       $ 7.50            
Payments of financial advisor fees             $ 116,000                    
Advisor fees as a percentage of proceeds             7.00%                    
Amended Warrants                                  
Debt Instrument [Line Items]                                  
Exercise price (in dollars per share) | $ / shares                             $ 5.40    
Loss on modification of warrants                         $ 1,100,000        
Warrants term                             5 years    
Advisor Warrants                                  
Debt Instrument [Line Items]                                  
Stock rights issued (in shares) | shares | shares             15,466                    
Senior Secured Convertible Promissory Notes                                  
Debt Instrument [Line Items]                                  
Debt discount               $ 400,000         400,000        
Conversion of convertible debt plus interest into common stock         $ 2,800,000                        
Debt instrument, term         18 months                        
Quarter 3 2018 Warrants                                  
Debt Instrument [Line Items]                                  
Stock rights issued (in shares) | shares | shares                     196,340            
Exercise price (in dollars per share) | $ / shares                             $ 5.40    
Warrants term                             5 years    
Quarter 4 2018 Warrants                                  
Debt Instrument [Line Items]                                  
Stock rights issued (in shares) | shares | shares                   300,115              
2018 Note Agreement                                  
Debt Instrument [Line Items]                                  
Debt instrument, face amount           $ 3,296,703                      
Exercise price (in dollars per share) | $ / shares             $ 4.50                    
2018 Note Agreement | April 2018 Warrants                                  
Debt Instrument [Line Items]                                  
Conversion price per share | $ / shares             $ 11.25                    
2018 Note Agreement | Advisor Warrants                                  
Debt Instrument [Line Items]                                  
Stock rights issued (in shares) | shares | shares             15,466                    
Warrants, fair value             $ 100,000                    
Exercise price (in dollars per share) | $ / shares             $ 11.25                    
April 2018 Bridge Notes                                  
Debt Instrument [Line Items]                                  
Derivative liability from debt discount                     $ 100,000            
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               39,000   $ 4,377,000     39,000        
Long-term debt, net of current maturities               0   0     0        
Convertible Debt [Member] | Quarter 3 2018 Warrants                                  
Debt Instrument [Line Items]                                  
Warrants, fair value                     $ 700,000            
Exercise price (in dollars per share) | $ / shares                     $ 11.25            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares                     196,340            
Convertible Debt [Member] | Quarter 4 2018 Warrants                                  
Debt Instrument [Line Items]                                  
Warrants, fair value                   $ 700,000              
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] | Convertible Bridge Loan                                  
Debt Instrument [Line Items]                                  
Debt instrument, face amount               1,800,000         1,800,000        
Interest rate (as a percent)                     8.00%            
Discount percentage                     9.00%            
Conversion threshold percentage of stock price trigger                     80.00%            
Convertible debt, threshold consecutive trading days | item                     10            
Conversion price per share | $ / shares                     $ 7.50            
Repayment Period                     180 days            
Debt discount and debt issuance costs as a reduction of the related debt               1,800,000         1,800,000        
Early repayment trigger, amount of gross proceeds                         7,000,000        
Debt Instrument, Period To File Registration Statement                     30 days            
Percentage per month charged as damages if registration statement not filed by deadline                     1.00%            
Debt discount               2,158,000 $ 1,053,000 $ 1,111,000 $ 164,000 1,815,000 2,158,000 1,815,000      
Debt issuance costs, net                     $ 164,000            
Beneficial conversion feature                         1,100,000        
Net debt issuance costs and debt discounts               2,700,000         2,700,000        
Loss on issuance of convertible notes                         900,000        
Debt, carrying amount       $ 6,600,000                          
Debt premium on debt               91,000   $ 647,000     91,000        
Number of shares converted from debt instrument (in shares) | shares       1,869,352                          
Conversion of convertible debt plus interest into common stock       $ 4,400,000                          
Amortization of debt discount               55,000       9,000 113,000 9,000      
Amortization of debt premium               7,000         $ 167,000        
Convertible Debt [Member] | Convertible Bridge Loan | Debt Instrument, Redemption, Period One                                  
Debt Instrument [Line Items]                                  
Debt instrument, redemption price, percentage                         105.00%        
Convertible Debt [Member] | Convertible Bridge Loan | Debt Instrument, Redemption, Period Two                                  
Debt Instrument [Line Items]                                  
Debt instrument, redemption price, percentage                         110.00%        
Convertible Debt [Member] | Convertible Bridge Loan | Debt Instrument, Redemption, Period Three                                  
Debt Instrument [Line Items]                                  
Debt instrument, redemption price, percentage                         115.00%        
Convertible Debt [Member] | Convertible Bridge Loan | Minimum                                  
Debt Instrument [Line Items]                                  
Conversion price per share | $ / shares                     $ 4.50            
Convertible Debt [Member] | Convertible Bridge Loan | Maximum                                  
Debt Instrument [Line Items]                                  
Debt instrument, term                         1 year        
Convertible Debt [Member] | April 2018 Bridge Notes                                  
Debt Instrument [Line Items]                                  
Discount percentage                         9.00%        
Proceeds from issuance of debt                         $ 1,660,000        
Total debt               1,824,176         1,824,176        
Proceeds from convertible notes                         1,660,000        
Amortization of debt discount               $ 0       $ 9,000 $ 0 $ 9,000      
Convertible Debt [Member] | April 2019 Bridge Notes                                  
Debt Instrument [Line Items]                                  
Debt instrument, face amount   $ 1,000,000                              
Discount percentage   9.00%                              
Proceeds from issuance of debt   $ 900,000                              
Total debt   989,011                              
Debt discount and debt issuance costs as a reduction of the related debt   1,000,000                              
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                              
Net debt issuance costs and debt discounts   2,000,000                              
Loss on issuance of convertible notes   1,000,000                              
Proceeds from convertible notes   $ 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 and debt issuance costs as a reduction of the related debt 1,100,000                                
Debt discount 99,000                                
Beneficial conversion feature 900,000                                
Net debt issuance costs and debt discounts 2,000,000                                
Loss on issuance of convertible notes $ 900,000                                
Original issue discount (as a percent) 9                                
Proceeds from convertible notes $ 1,000,000                                
Floor price | $ / shares $ 2.25                                
Convertible Debt [Member] | Quarter 4 2018 Bridge Notes                                  
Debt Instrument [Line Items]                                  
Number of shares converted from debt instrument (in shares) | shares               756,588         1,776,018        
Conversion of convertible debt plus interest into common stock               $ 2,100,000         $ 4,200,000