Annual report pursuant to Section 13 and 15(d)

Consolidated Statements of Stockholder's Equity

v3.22.0.1
Consolidated Statements of Stockholder's Equity - USD ($)
$ in Thousands
Total
December 2019 Public Offering [Member]
April 2020 Private Placement [Member]
July 2020 Registered Direct Offering [Member]
August 2020 Public Offering [Member]
December 2020 Public Offering [Member]
May 2021 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]
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 2020 Public Offering [Member]
Common stock [Member]
May 2021 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]
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]
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 2020 Public Offering [Member]
Additional paid-in capital [Member]
May 2021 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 $ 15,802                   $ 18                           $ 41,161                     $ 4 $ (25,381)  
Beginning Balance, Shares at Dec. 31, 2017                     336,055                   579                                  
Stock-based compensation expense 1,201                                               1,201                          
Restricted stock unit settlements, Shares                     254                                                      
Ending Balance at Dec. 31, 2018                   $ (3)                                                       $ (3)
Adjustments to final October 2018 financing costs 4             $ 116                                 4                 $ 116        
Accounting Standards Update [Extensible List]                   ASU 2016-02 [Member]                                                        
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 (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 exercise of warrants $ 3,231                   $ 7                           3,224                          
Shares issued on exercise of warrants, Shares                     489,947                                                      
Shares issued on conversion of preferred shares                       $ 2 $ 2                         $ (2) $ (2)                      
Shares issued on conversion of preferred shares, Shares                         93,379                   (1,121)                              
Costs relating to financing and purchase agreement   $ (34)             $ (14)                                     $ (34)             $ (14)      
Net 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                                                      
Stock-based compensation expense 2,187                                               2,187                          
Restricted stock unit settlements $ (1)                                               (1)                          
Restricted stock unit settlements, Shares 231                   145                                                      
Shares issued $ 41           $ 21,343                       $ 3           41               $ 21,340          
Shares issued, Shares                     5,114               3,285,714                                      
Shares issued on exercise of warrants 338                                               338                          
Shares issued on exercise of warrants, Shares                     50,834                                                      
Net loss (33,152)                                                                       (33,152)  
Ending Balance at Dec. 31, 2021 $ 28,042                   $ 79                           $ 121,545                     $ 4 $ (93,586)  
Ending Balance, Shares at Dec. 31, 2021                     9,453,542