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CONVERTIBLE NOTES - Bridge Notes (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 26, 2020
$ / shares
Mar. 25, 2020
$ / shares
May 14, 2019
USD ($)
D
$ / shares
shares
Apr. 30, 2019
$ / shares
Apr. 16, 2019
USD ($)
D
$ / shares
shares
Apr. 30, 2018
$ / shares
shares
Sep. 30, 2019
USD ($)
shares
Sep. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
shares
Mar. 31, 2020
$ / shares
Feb. 29, 2020
$ / shares
Dec. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
$ / shares
Apr. 20, 2018
USD ($)
Aug. 31, 2017
$ / shares
Debt Instrument [Line Items]                                
Proceeds from issuance of debt                 $ 2,150,000              
Total debt               $ 1,030,000       $ 519,000        
Loss on extinguishment of convertible notes               (1,225,000)                
Loss on modification of warrants                 (1,128,000)              
Proceeds from convertible notes                 2,150,000              
Loss on extinguishment of convertible notes               (1,225,000)                
Conversion of convertible debt into common stock               2,176,000 7,390,000              
Long-term debt, net of current maturities               500,000       198,000        
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       1 year   5 years                    
April 2018 Warrants, Second Half                                
Debt Instrument [Line Items]                                
Class of Warrant or Right, Term       5 years 1 year 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                    
Loss on modification of warrants                 1,100,000              
Quarter 3 2018 Warrants                                
Debt Instrument [Line Items]                                
Exercise price (in dollars per share) | $ / shares       $ 5.40                        
Loss on modification of warrants             $ 0   400,000              
Warrants term       5 years                        
April 2019 Bridge Notes And May 2019 Bridge Notes                                
Debt Instrument [Line Items]                                
Guaranteed interest period 18 months 12 months                            
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                          
Quarter 4 2018 Bridge Notes                                
Debt Instrument [Line Items]                                
Write off of debt premium with an offset to additional paid in capital                 500,000              
Convertible Debt [Member]                                
Debt Instrument [Line Items]                                
Debt, carrying amount                     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    
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 $ 0.40 $ 2.25                            
Fair value of convertible debt               2,600,000                
Debt premium on debt               800,000                
Loss on extinguishment of convertible notes               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             $ 2,054,000   $ 2,054,000     $ 1,796,000 $ 2,158,000 $ 1,111,000    
Exercise price (in dollars per share) | $ / shares         $ 7.50                      
Debt premium on debt                           647,000    
Number of shares converted from debt instrument (in shares) | shares             52,748 3,908,145 1,828,766              
Conversion of convertible debt into common stock             $ 100,000 $ 2,200,000 $ 4,600,000              
Debt Instrument, Unamortized Premium                           $ 647,000    
Amortization of debt discount             $ 41,000 703,000 154,000              
Amortization of debt premium               $ 385,000 $ 167,000              
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                      
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 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                          
Beneficial conversion     $ 900,000