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CONVERTIBLE NOTES - Bridge Notes (Details)
1 Months Ended 12 Months Ended
Mar. 26, 2020
$ / shares
Mar. 25, 2020
$ / shares
May 14, 2019
USD ($)
D
$ / shares
shares
Apr. 16, 2019
USD ($)
D
$ / shares
shares
Apr. 30, 2019
$ / shares
Apr. 30, 2018
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
shares
May 14, 2020
USD ($)
Apr. 20, 2020
USD ($)
Apr. 16, 2020
USD ($)
Mar. 31, 2020
$ / shares
Feb. 29, 2020
$ / shares
Apr. 15, 2019
$ / shares
Mar. 31, 2019
$ / shares
Dec. 31, 2018
USD ($)
$ / shares
Oct. 03, 2017
$ / shares
Debt Instrument [Line Items]                                  
Proceeds from issuance of debt               $ 2,150,000                  
Total debt             $ 1,010,000 519,000                  
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, plus interest, into common stock             2,176,000 7,553,000                  
Long-term debt, net of current maturities             $ 362,000 198,000                  
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           1 year                      
Warrants term         5 years                        
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                  
Amended Warrants                                  
Debt Instrument [Line Items]                                  
Exercise price (in dollars per share) | $ / shares       $ 5.40                          
Warrants term       5 years                          
Quarter 3 2018 Warrants                                  
Debt Instrument [Line Items]                                  
Exercise price (in dollars per share) | $ / shares         $ 5.40                   $ 7.50    
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                            
Convertible Debt [Member]                                  
Debt Instrument [Line Items]                                  
Total debt               142,000                  
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 [Member]                                  
Debt Instrument [Line Items]                                  
Debt discount               $ 1,796,000               $ 1,111,000  
Exercise price (in dollars per share) | $ / shares                           $ 7.50      
Debt premium on debt                               647,000  
Warrant liability canceled due to settlement of equity instruments             $ 2,200,000                    
Number of shares converted from debt instrument (in shares) | shares             3,908,145 1,900,766                  
Conversion of convertible debt, plus interest, into common stock               $ 4,800,000                  
Debt Instrument, Unamortized Premium                               $ 647,000  
Warrants term       1 year                          
Amortization of debt discount             $ 703,000 273,000                  
Amortization of debt premium             $ 385,000 167,000                  
Convertible Debt [Member] | Quarter 3 2018 Bridge Notes                                  
Debt Instrument [Line Items]                                  
Beneficial conversion feature               500,000                  
Beneficial conversion               500,000                  
Convertible Debt [Member] | April 2019 Bridge Notes                                  
Debt Instrument [Line Items]                                  
Debt instrument, face amount                     $ 1,000,000            
Discount percentage       9.00%                          
Repayment Period       180 days                          
Proceeds from issuance of debt       $ 900,000                          
Total debt       1,000,000                          
Debt discount and debt issuance costs as a reduction of the related debt       1,000,000                          
Debt discount       $ 100,000                          
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     $ 1,100,000                            
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           $ 1,100,000                
Debt discount     100,000                            
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