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Consolidated Statements of Stockholders' Deficit - USD ($)
$ in Thousands
Total
Series D Preferred Stock [Member]
Series E Preferred Stock [Member]
Series E-1 Preferred Stock [Member]
Common Stock [Member]
Common Stock [Member]
Series D Warrants [Member]
Preferred Stock [Member]
Preferred Stock [Member]
Series D Preferred Stock [Member]
Preferred Stock [Member]
Series E Preferred Stock [Member]
Preferred Stock [Member]
Series E-1 Preferred Stock [Member]
Treasury Stock [Member]
Additional Paid in Capital [Member]
Additional Paid in Capital [Member]
Series D Preferred Stock [Member]
Additional Paid in Capital [Member]
Series E Preferred Stock [Member]
Additional Paid in Capital [Member]
Series E-1 Preferred Stock [Member]
Accumulated Deficit [Member]
Accumulated Deficit [Member]
Series E Preferred Stock [Member]
Accumulated Deficit [Member]
Series E-1 Preferred Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2017 $ 678                   $ (51) $ 325,519       $ (324,832)     $ 42
Balance (in shares) at Dec. 31, 2017         377           (1)                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Compensation expense for issuance of restricted stock 98                     98              
Compensation expense for issuance of restricted stock (in shares)         236                            
Compensation income related to cancellation of stock options (40)                     (40)              
Sale of common stock, net of expenses 10,916                     10,916              
Sale of common stock, net of expenses (in shares)         7,624                            
Issuance of pre-funded warrants 520                     520              
Cashless exercise of warrants (in shares)         49                            
Fair value of warrants issued with Convertible Notes 5,007                     5,007              
Fair value of warrants reclassified from liability to equity 4,210                     4,210              
Beneficial conversion feature of convertible note 44                     44              
Issuance of Preferred Stock   $ 1,004                     $ 1,004            
Issuance of Preferred Stock (in shares)               101                      
Fair value of warrants exchanged for Common Stock 144                     144              
Retirement of Treasury Stock                     $ 51 (51)              
Retirement of Treasury Stock (in shares)                     1                
Exercise of pre-funded warrants (in shares)         5,250                            
Fair value of warrants issued (18,306)                     (18,306)              
Foreign currency translation 8                                    
Exchange of warrants for common stock (in shares)         1,179                            
Net (loss) income (19,222)                             (19,222)      
Total comprehensive loss 8                                   8
Balance at Dec. 31, 2018 (14,939)                     329,065       (344,054)     50
Balance (in shares) at Dec. 31, 2018         14,715   101                        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Compensation expense for issuance of stock options 273                     273              
Compensation expense for issuance of restricted stock 4                     4              
Compensation expense for issuance of restricted stock (in shares)         20                            
Shares issued due to fractional rounding upon reverse stock split         $ 1             (1)              
Shares issued due to fractional rounding upon reverse stock split (in shares)         27,524                            
Issuance of Preferred Stock   $ 150 $ 29,536 $ 9,510                 $ 150 $ 42,876 $ 14,408   $ (13,340) $ (4,898)  
Issuance of Preferred Stock (in shares)               15 32,572 9,510                  
Retirement of Series D Preferred Stock (1,160)                     (1,160)              
Retirement of Series D Preferred Stock (in Shares)             (116)                        
Exercise of pre-funded warrants (in shares)           11,285                          
Fair value of warrants issued (20,844)                     (20,844)              
Foreign currency translation (22)                                    
Exchange of warrants for Common Stock $ 13                     13              
Exchange of warrants for common stock (in shares) 82,521       92                            
Conversion of Preferred stock into common stock $ 1                     1              
Conversion of Preferred stock into common stock (in shares)         13,455   (565)                        
Net (loss) income (8,879)                             (8,879)      
Total comprehensive loss (22)                                   (22)
Balance at Dec. 31, 2019 $ (6,357)       $ 1             $ 364,785       $ (371,171)     $ 28
Balance (in shares) at Dec. 31, 2019         67,091   41,517