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Condensed Consolidated Statements of Stockholders' Deficit (Unaudited) - USD ($)
$ in Thousands
Total
Series D Warrants [Member]
Series D Preferred Stock [Member]
Common Stock [Member]
Common Stock [Member]
Series D Warrants [Member]
Preferred Stock [Member]
Preferred Stock [Member]
Series D Preferred Stock [Member]
Treasury 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]
Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2017 $ 678     $ 3       $ (51) $ 325,516     $ (324,832) $ 42
Balance (in shares) at Dec. 31, 2017       263,305       (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 4,251     $ 6         4,245        
Sale of common stock, net of expenses (in shares)       668,854                  
Fair value of warrants issued (18,306)               (18,306)        
Net (loss) income 7,185                     7,185  
Total comprehensive loss (34)                       (34)
Balance at Mar. 31, 2018 (6,205)     $ 9       $ (51) 311,476     (317,647) 8
Balance (in shares) at Mar. 31, 2018       932,159       (1)          
Balance at Dec. 31, 2017 678     $ 3       $ (51) 325,516     (324,832) 42
Balance (in shares) at Dec. 31, 2017       263,305       (1)          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Net (loss) income 527                        
Balance at Jun. 30, 2018 (13,090)     $ 9       $ (51) 311,293     (324,305) (36)
Balance (in shares) at Jun. 30, 2018       932,159       (1)          
Balance at Mar. 31, 2018 (6,205)     $ 9       $ (51) 311,476     (317,647) 8
Balance (in shares) at Mar. 31, 2018       932,159       (1)          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Compensation expense for issuance of stock options (47)               (47)        
Compensation expense for issuance of restricted stock (95)               (95)        
Sale of common stock, net of expenses (41)               (41)        
Net (loss) income (6,658)                     (6,658)  
Total comprehensive loss (44)                       (44)
Balance at Jun. 30, 2018 (13,090)     $ 9       $ (51) 311,293     (324,305) (36)
Balance (in shares) at Jun. 30, 2018       932,159       (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 (7,894)                     (7,894)  
Total comprehensive loss 7                       7
Balance at Mar. 31, 2019 (23,778)     $ 144         327,969     (351,948) 57
Balance (in shares) at Mar. 31, 2019       14,434,454                  
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]                          
Exchange of warrants (in shares) 64,000                        
Net (loss) income $ (13,853)                        
Balance at Jun. 30, 2019 (29,729)     $ 183         328,018     (357,907) (23)
Balance (in shares) at Jun. 30, 2019       18,277,807                  
Balance at Mar. 31, 2019 (23,778)     $ 144         327,969     (351,948) 57
Balance (in shares) at Mar. 31, 2019       14,434,454                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Compensation expense for issuance of stock options 75               75        
Exercise of Pre-Funded Series D Warrants   $ (1)     $ 38         $ (39)      
Exercise of pre-funded Series D Warrants (in shares)         3,779,353                
Exchange of warrants 14     $ 1         13        
Exchange of warrants (in shares)       64,000                  
Net (loss) income (5,959)                     (5,959)  
Total comprehensive loss (80)                       (80)
Balance at Jun. 30, 2019 $ (29,729)     $ 183         $ 328,018     $ (357,907) $ (23)
Balance (in shares) at Jun. 30, 2019       18,277,807