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Consolidated Statements of Stockholders' Equity (Deficit) - USD ($)
$ in Thousands
Total
Series D Preferred Stock [Member]
Common Stock Issued [Member]
Common Stock Issued [Member]
Scenario, Previously Reported [Member]
Preferred Stock Issued [Member]
Preferred Stock Issued [Member]
Series D Preferred Stock [Member]
Treasury Stock [Member]
Additional Paid in Capital [Member]
Additional Paid in Capital [Member]
Scenario, Previously Reported [Member]
Additional Paid in Capital [Member]
Series D Preferred Stock [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Series D Warrants [Member]
Series D Warrants [Member]
Common Stock Issued [Member]
Series D Warrants [Member]
Additional Paid in Capital [Member]
Balance at Dec. 31, 2016 $ (1,490)           $ (51) $ 277,790     $ (279,188) $ (41)      
Balance (in shares) at Dec. 31, 2016     24       (1)                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                              
Compensation expense for issuance of stock options 50             50              
Compensation expense for issuance of restricted stock 79             79              
Issuance of common stock and rights for payments made in shares on convertible notes payable 40,121   $ 2         40,119              
Issuance of common stock and rights for payments made in shares on convertible notes payable (in shares)     262,462                        
Fair value of beneficial conversion feature of convertible note 4,908             4,908              
Series B preferred stock dividend (527)                   (527)        
Warrants exercised 19             19              
Warrants exercised (in shares)     736                        
Fair value of warrants exercised 2,552             2,552              
Adjustment for rounding related to Nov 2017 reverse stock split, (in shares)     93                        
Net (loss) income (45,117)                   (45,117)        
Foreign currency translation 83                     83      
Balance at Dec. 31, 2017 678   $ 3 $ 2     $ (51) 325,516 $ 325,517   (324,832) 42      
Balance (in shares) at Dec. 31, 2017     263,305 263,315     (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 in Feb 2018 public offering (18,306)             (18,306)              
Net (loss) income 7,185                   7,185        
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]                              
Total comprehensive loss (34)                     (34)      
Balance at Dec. 31, 2017 678   $ 3 $ 2     $ (51) 325,516 325,517   (324,832) 42      
Balance (in shares) at Dec. 31, 2017     263,305 263,315     (1)                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                              
Net (loss) income 527                            
Foreign currency translation (78)                            
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, 2017 678   $ 3 $ 2     $ (51) 325,516 $ 325,517   (324,832) 42      
Balance (in shares) at Dec. 31, 2017     263,305 263,315     (1)                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                              
Compensation income related to cancellation of stock options (40)             (40)              
Compensation expense for issuance of restricted stock 98   $ 2         96              
Compensation expense for issuance of restricted stock (in shares)     164,989                        
Sale of common stock, net of expenses 10,916   $ 54         10,862              
Sale of common stock, net of expenses (in shares)     5,336,665                        
Fair value of warrants issued in Feb 2018 public offering (18,306)             (18,306)              
Cashless exercise of warrants (in shares)     34,467                        
Issuance of pre-funded warrants 520             520              
Exercise of Pre-Funded Series D Warrants     $ 37         (37)              
Exercise of pre-funded Series D Warrants (in shares)     3,675,516                        
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              
Fair value of beneficial conversion feature of convertible note 44             44              
Issuance of Series D Preferred Stock   $ 1,004               $ 1,004          
Issuance of Series D Preferred Stock (in shares)           101                  
Exchange of warrants for common stock     $ 8         (8)              
Exchange of warrants for common stock (in shares)     825,002                        
Fair value of warrants exchanged for common stock 144             144              
Retirement of Treasury Stock             $ 51 (51)              
Retirement of Treasury Stock (in shares)             1                
Net (loss) income (19,222)                   (19,222)        
Foreign currency translation 8                     8      
Balance at Dec. 31, 2018 (14,939)   $ 103       $ 0 328,962     (344,054) 50      
Balance (in shares) at Dec. 31, 2018     10,299,954   101                    
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)        
Foreign currency translation (36)                            
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]                              
Total comprehensive loss (44)                     (44)      
Balance at Dec. 31, 2018 (14,939)   $ 103       $ 0 328,962     (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                        
Exercise of Pre-Funded Series D Warrants                           $ 41 $ (41)
Exercise of pre-funded Series D Warrants (in shares)                           4,119,500  
Issuance of Series D Preferred Stock   $ 150               $ 150          
Issuance of Series D Preferred Stock (in shares)           15                  
Net (loss) income (7,894)                   (7,894)        
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]                              
Retirement of Series D Preferred Stock (1,160)             (1,160)              
Retirement of Series D Preferred Stock (in Shares)         (116)                    
Total comprehensive loss 7                     7      
Balance at Dec. 31, 2018 $ (14,939)   $ 103       $ 0 328,962     (344,054) 50      
Balance (in shares) at Dec. 31, 2018     10,299,954   101                    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                              
Exchange of warrants for common stock (in shares) 64,000                            
Net (loss) income $ (13,853)                            
Foreign currency translation (74)                            
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 for common stock 14   $ 1         13              
Exchange of warrants for common stock (in shares)     64,000                        
Net (loss) income (5,959)                   (5,959)        
Foreign currency translation (23)                            
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]                              
Total comprehensive loss $ (80)                     $ (80)