Annual report pursuant to Section 13 and 15(d)

Consolidated Statements of Stockholder's Equity

v3.20.4
Consolidated Statements of Stockholder's Equity - USD ($)
$ in Thousands
Total
December 2019 Public Offering [Member]
June 2018 Public Offering [Member]
April 2020 Private Placement [Member]
July 2020 Registered Direct Offering [Member]
August 2020 Public Offering [Member]
December Two Thousand Twenty Public Offering [Member]
June 2018 Financing Costs [Member]
Lincoln Park Capital Fund L L C
Cumulative Adjustment on Adoption of Lease Standard [Member]
Common stock [Member]
Common stock [Member]
Series A Convertible Preferred Stock [Member]
Common stock [Member]
Series B Convertible Preferred Stock [Member]
Common stock [Member]
December 2019 Public Offering [Member]
Common stock [Member]
June 2018 Public Offering [Member]
Common stock [Member]
April 2020 Private Placement [Member]
Common stock [Member]
July 2020 Registered Direct Offering [Member]
Common stock [Member]
August 2020 Public Offering [Member]
Common stock [Member]
December Two Thousand Twenty Public Offering [Member]
Common stock [Member]
Lincoln Park Capital Fund L L C
Preferred Stock [Member]
Preferred Stock [Member]
Series A Convertible Preferred Stock [Member]
Preferred Stock [Member]
Series B Convertible Preferred Stock [Member]
Preferred Stock [Member]
December 2019 Public Offering [Member]
Preferred Stock [Member]
June 2018 Public Offering [Member]
Additional paid-in capital [Member]
Additional paid-in capital [Member]
Series A Convertible Preferred Stock [Member]
Additional paid-in capital [Member]
Series B Convertible Preferred Stock [Member]
Additional paid-in capital [Member]
December 2019 Public Offering [Member]
Additional paid-in capital [Member]
June 2018 Public Offering [Member]
Additional paid-in capital [Member]
April 2020 Private Placement [Member]
Additional paid-in capital [Member]
July 2020 Registered Direct Offering [Member]
Additional paid-in capital [Member]
August 2020 Public Offering [Member]
Additional paid-in capital [Member]
December Two Thousand Twenty Public Offering [Member]
Additional paid-in capital [Member]
June 2018 Financing Costs [Member]
Additional paid-in capital [Member]
Lincoln Park Capital Fund L L C
Accumulated other comprehensive income (loss) [Member]
Accumulated deficit [Member]
Accumulated deficit [Member]
Cumulative Adjustment on Adoption of Lease Standard [Member]
Beginning Balance at Dec. 31, 2017 $ 7,879                   $ 12                             $ 20,556                     $ 5 $ (12,694)  
Beginning Balance, Shares at Dec. 31, 2017                     59,739                                                        
Stock-based compensation expense 854                                                 854                          
Restricted Stock Unit Settlements, Shares                     267                                                        
Adjustment of fractional shares on reverse stock split, Shares                     1                                                        
Shares issued     $ 12,194   $ 4,960       $ 1,279           $ 1   $ 2     $ 1                   $ 12,193   $ 4,958       $ 1,278      
Shares issued, Shares                             58,025   89,462     4,800         9,158                            
Shares issued on exercise of warrants 1,324                                                 1,324                          
Shares issued on exercise of warrants, Shares                     16,525                                                        
Shares issued on conversion of preferred shares                       $ 2                             $ (2)                        
Shares issued on conversion of preferred shares, Shares                       107,236                   (8,579)                                  
Other comprehensive income (loss) (1)                                                                       (1)    
Net loss and comprehensive loss (12,687)                                                                         (12,687)  
Ending Balance at Dec. 31, 2018 15,802                 $ (3) $ 18                             41,161                     4 (25,381) $ (3)
Ending Balance, Shares at Dec. 31, 2018                     336,055                   579                                    
Stock-based compensation expense $ 1,201                                                 1,201                          
Restricted Stock Unit Settlements, Shares 256                   254                                                        
Adjustments to final October 2018 financing costs $ 4             $ 116                                   4                 $ 116        
Accounting Standards Update [Extensible List]                   us-gaap:AccountingStandardsUpdate201602Member                                                          
Shares issued   $ 12,334             792         $ 13                             $ 12,321             792      
Shares issued, Shares                           628,876           18,700       6,256                              
Shares issued on exercise of warrants 4,199                   $ 1                             4,198                          
Shares issued on exercise of warrants, Shares                     55,390                                                        
Shares issued on conversion of preferred shares                         $ 9                             $ (9)                      
Shares issued on conversion of preferred shares, Shares                       7,237 427,746                 (579) (5,135)                                
Issuance of inducement warrants                                                   3,925                       (3,925)  
Net loss and comprehensive loss (16,395)                                                                         (16,395)  
Ending Balance at Dec. 31, 2019 18,050                   $ 41                             63,709                     4 (45,704)  
Ending Balance, Shares at Dec. 31, 2019                     1,474,258                   1,121                                    
Stock-based compensation expense $ 1,286                                                 1,286                          
Restricted Stock Unit Settlements, Shares 236                   128                                                        
Adjustment of fractional shares on reverse stock split, Shares                     (9)                                                        
Shares issued       $ 1,579 $ 5,307 $ 6,822 $ 15,789                 $ 6 $ 15 $ 1 $ 2                       $ 1,573 $ 5,292 $ 6,821 $ 15,787          
Shares issued, Shares                               280,782 731,707 569,043 2,472,500                                        
Shares issued on conversion of preferred shares                       $ 2 $ 2                           $ (2) $ (2)                      
Shares issued on conversion of preferred shares, Shares                         93,379                   (1,121)                                
Shares Issued On Exercise Of Warrants Value $ 3,231                   $ 7                             3,224                          
Shares issued on exercise of warrants, Shares                     489,947                                                        
Costs relating to financing and purchase agreement   $ (34)             $ (14)                                       $ (34)             $ (14)      
Net loss and comprehensive loss (14,730)                                                                         (14,730)  
Ending Balance at Dec. 31, 2020 $ 37,286                   $ 76                             $ 97,640                     $ 4 $ (60,434)  
Ending Balance, Shares at Dec. 31, 2020                     6,111,735