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Condensed Consolidated Statements of Stockholders' Deficit (Unaudited) - USD ($)
$ in Thousands
Total
Series D Warrants [Member]
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 Warrants [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         $ 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 (8,353)                                        
Balance at Sep. 30, 2018 (4,865)         $ 57           $ (51) 328,209         (333,185)     105
Balance (in shares) at Sep. 30, 2018           5,694,437           (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)                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                          
Compensation expense for issuance of restricted stock 116         $ 1             115                
Compensation expense for issuance of restricted stock (in shares)           60,000                              
Sale of common stock, net of expenses 7,067         $ 47             7,020                
Sale of common stock, net of expenses (in shares)           4,667,811                              
Issuance of pre-funded warrants 520                       520                
Cashless exercise of warrants (in shares)           34,467                              
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                
Net (loss) income (8,880)                                 (8,880)      
Total comprehensive loss 141                                       141
Balance at Sep. 30, 2018 (4,865)         $ 57           $ (51) 328,209         (333,185)     105
Balance (in shares) at Sep. 30, 2018           5,694,437           (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 Preferred Stock     $ 150                       $ 150            
Issuance of 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) 57,786,387                                        
Net (loss) income $ (21,371)                                        
Balance at Sep. 30, 2019 (18,825)         $ 183             364,567         (383,664)     89
Balance (in shares) at Sep. 30, 2019           18,277,807   42,082                          
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                              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                          
Compensation expense for issuance of stock options 70                       70                
Issuance of Preferred Stock       $ 29,575 $ 9,510                     $ 42,915 $ 14,408   $ (13,340) $ (4,898)  
Issuance of Preferred Stock (in shares)                   32,572 9,510                    
Fair value of warrants issued (20,844)                       (20,844)                
Net (loss) income (7,519)                                 (7,519)      
Total comprehensive loss 112                                       112
Balance at Sep. 30, 2019 $ (18,825)         $ 183             $ 364,567         $ (383,664)     $ 89
Balance (in shares) at Sep. 30, 2019           18,277,807   42,082