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CONVERTIBLE NOTES - Bridge Notes (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 12, 2019
USD ($)
shares
Nov. 29, 2018
USD ($)
D
$ / shares
shares
Sep. 17, 2018
USD ($)
Apr. 20, 2018
USD ($)
Apr. 30, 2018
USD ($)
$ / shares
shares
Mar. 31, 2019
USD ($)
item
$ / shares
shares
Dec. 31, 2018
USD ($)
item
shares
Sep. 30, 2018
USD ($)
item
$ / shares
shares
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
shares
Jan. 02, 2019
Sep. 20, 2018
$ / shares
Sep. 19, 2018
$ / shares
Jul. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
Aug. 31, 2017
$ / shares
Debt Instrument [Line Items]                                
Interest rate (as a percent)                     8.00%          
Proceeds from issuance of debt           $ 250,000                    
Total debt           399,000 $ 516,000     $ 516,000            
Warrant revaluation and modification           (240,000)     $ (261,000)              
Derivative liability from debt discount           $ 400,000                    
Derivative asset (liability)                 0           $ 62,000  
Debt premium on debt             $ 900,000     900,000            
Warrant liability canceled due to settlement of equity instruments                 $ 456,000              
Number of shares converted from debt instrument (in shares) | shares 120,983           93,333                  
Conversion of convertible debt plus interest into common stock $ 1,900,000           $ 200,000                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares           917,563                    
Wrote-off of debt discount with an offset to additional paid in capital           $ (315,000)                    
Write-off debt derivative liability in conjunction with convertible note conversions           39,000                    
Long-term debt, net of current maturities           238,000 $ 253,000     253,000            
Bridge Notes Redemption Feature [Member]                                
Debt Instrument [Line Items]                                
Derivative asset (liability)                             $ 30,000  
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                   $ 45.00
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         243,223                      
Warrants, fair value         $ 1,100,000                      
Exercise price (in dollars per share) | $ / shares                       $ 7.50 $ 11.25      
Payments of financial advisor fees         $ 116,000                      
Advisor fees as a percentage of proceeds         7.00%                      
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                    
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               196,337                
Warrants, fair value               $ 700,000                
Quarter 4 2018 Warrants                                
Debt Instrument [Line Items]                                
Stock rights issued (in shares) | shares | shares             300,114                  
Debt discounts written-off as a result of the extinguishment of certain Bridge Notes             $ 15,000                  
2018 Note Agreement                                
Debt Instrument [Line Items]                                
Debt instrument, face amount       $ 3,296,703                        
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                      
Convertible Bridge Loan | Quarter 4 2018 Warrants                                
Debt Instrument [Line Items]                                
Warrants, fair value             $ 700,000     $ 700,000            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares             300,114     300,114            
Quarter 3 2018 Bridge Notes                                
Debt Instrument [Line Items]                                
Derivative liability from debt discount               100,000                
April 2018 Bridge Notes                                
Debt Instrument [Line Items]                                
Number of additional drawdowns completed | item           3                    
Derivative liability from debt discount               $ 100,000                
Quarter 4 2018 Bridge Notes                                
Debt Instrument [Line Items]                                
Total debt             $ 1,400,000     $ 1,400,000            
Debt discount and debt issuance costs as a reduction of the related debt             1,100,000     1,100,000            
Write off of debt premium with an offset to additional paid in capital             500,000                  
Quarter 4 2018 Bridge Notes | Amendment Agreement                                
Debt Instrument [Line Items]                                
Proceeds from issuance of debt             $ 1,100,000     300,000            
Number of additional drawdowns completed | item             2                  
Total debt           $ 1,100,000 $ 1,200,000     1,200,000            
Debt discount             108,000,000     108,000,000            
Convertible Debt [Member]                                
Debt Instrument [Line Items]                                
Debt, carrying amount           $ 3,129,000 4,377,000     4,377,000            
Number of shares converted from debt instrument (in shares) | shares           1,061,069                    
Conversion of convertible debt plus interest into common stock           $ 3,700,000                    
Long-term debt, net of current maturities           $ 0 0     0            
Convertible Debt [Member] | Convertible Bridge Loan                                
Debt Instrument [Line Items]                                
Interest rate (as a percent)               8.00%                
Discount percentage           9.00%   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                
Proceeds from issuance of debt           $ 1,300,000                    
Total debt           1,500,000                    
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           1,053,000 1,111,000 $ 164,000   1,111,000            
Debt issuance costs, net               $ 164,000                
Beneficial conversion feature           1,100,000                    
Debt, carrying amount   $ 4,500,000                            
Debt premium on debt           91,000 $ 647,000     $ 647,000            
Number of shares converted from debt instrument (in shares) | shares   1,112,762                            
Conversion of convertible debt plus interest into common stock   $ 2,300,000                            
Amortization of debt discount           58,000                    
Amortization of debt premium           $ 160,000                    
Convertible Debt [Member] | Convertible Bridge Loan | 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                            
Maximum borrowing amount   $ 1,318,681                            
Floor price | $ / shares   $ 2.25                            
Debt, carrying amount   $ 3,300,000                            
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] | Convertible Bridge Loan | Maximum | Amendment Agreement                                
Debt Instrument [Line Items]                                
Conversion price per share | $ / shares   $ 3.75                            
Convertible Debt [Member] | Quarter 3 2018 Bridge Notes                                
Debt Instrument [Line Items]                                
Discount percentage               9.00%                
Debt discount               $ 133,000                
Beneficial conversion feature           $ 500,000                    
Convertible Debt [Member] | July 2018 Bridge Notes | Debt Instrument, Redemption, Period One                                
Debt Instrument [Line Items]                                
Debt instrument, face amount                           $ 1.5    
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                    
Convertible Debt [Member] | Quarter 4 2018 Bridge Notes                                
Debt Instrument [Line Items]                                
Number of shares converted from debt instrument (in shares) | shares           1,019,430                    
Conversion of convertible debt plus interest into common stock           $ 2,100,000