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Condensed Consolidated Statements of Stockholders' Deficit (Unaudited) - USD ($)
$ in Thousands
Total
Series D Preferred Stock [Member]
Common Stock Issued [Member]
Common Stock Issued [Member]
Series D Warrants [Member]
Preferred Stock Issued [Member]
Preferred Stock Issued [Member]
Series D Preferred Stock [Member]
Additional Paid in Capital [Member]
Additional Paid in Capital [Member]
Series D Warrants [Member]
Additional Paid in Capital [Member]
Series D Preferred Stock [Member]
Accumulated Deficit [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2017 $ 678   $ 2       $ 325,517     $ (324,832) $ (51) $ 42
Balance (in shares) at Dec. 31, 2017     228,140               (1)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Compensation expense for issuance of stock options 7           7          
Compensation expense for issuance of restricted stock 14           14          
Sale of common stock, net of expenses 4,252   $ 7       4,245          
Sale of common stock, net of expenses (in shares)     668,855                  
Fair value of warrants issued (18,306)           (18,306)          
Net (loss) income 7,187                 7,187    
Total comprehensive loss (34)                     (34)
Balance at Mar. 31, 2018 (6,202)   $ 9       311,477     (317,645) $ (51) 8
Balance (in shares) at Mar. 31, 2018     896,995               (1)  
Balance at Dec. 31, 2018 (14,939)   $ 103       328,962     (344,054)   50
Balance (in shares) at Dec. 31, 2018     10,299,954   101              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Compensation expense for issuance of stock options 54           54          
Compensation expense for issuance of restricted stock 4           4          
Compensation expense for issuance of restricted stock (in shares)     15,000                  
Issuance of Series D Preferred Stock   $ 150             $ 150      
Issuance of Series D Preferred Stock (in shares)           15            
Retirement of Series D Preferred Stock   $ (1,160)             $ (1,160)      
Retirement of Series D Preferred Stock (in Shares)           (116)            
Exercise of Pre-Funded Series D Warrants       $ 41       $ (41)        
Exercise of pre-funded Series D Warrants (in shares)       4,119,500                
Net (loss) income (7,893)                 (7,893)    
Total comprehensive loss 7                     7
Balance at Mar. 31, 2019 $ (23,777)   $ 144       $ 327,969     $ (351,947)   $ 57
Balance (in shares) at Mar. 31, 2019     14,434,454