Annual report pursuant to Section 13 and 15(d)

Consolidated Statements of Stockholder's Equity

v3.22.4
Consolidated Statements of Stockholder's Equity - USD ($)
$ in Thousands
Total
May 2021 Public Offering [Member]
November 2022 Private Placement [Member]
July 2020 Registered Direct Offering [Member]
August 2020 Public Offering [Member]
December 2020 Public Offering [Member]
December 2019 Public Offering [Member]
Lincoln Park Capital Fund L L C
Common stock [Member]
Common stock [Member]
Series A Convertible Preferred Stock [Member]
Common stock [Member]
Series B Convertible Preferred Stock [Member]
Common stock [Member]
May 2021 Public Offering [Member]
Common stock [Member]
November 2022 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]
Preferred Stock [Member]
Preferred Stock [Member]
Series B Convertible Preferred Stock [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]
May 2021 Public Offering [Member]
Additional paid-in capital [Member]
November 2022 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]
December 2019 Public Offering [Member]
Additional paid-in capital [Member]
Lincoln Park Capital Fund L L C
Accumulated other comprehensive income (loss) [Member]
Accumulated deficit [Member]
Beginning Balance at Dec. 31, 2019 $ 18,050               $ 41                   $ 63,709                   $ 4 $ (45,704)
Beginning Balance, Shares at Dec. 31, 2019                 1,474,258               1,121                          
Stock-based compensation expense 1,286                                   1,286                      
Costs relating to financing and purchase agreement             $ (34) $ (14)                                     $ (34) $ (14)    
Shares issued on exercise of warrants 3,231               $ 7                   3,224                      
Shares issued on exercise of warrants, Shares                 489,947                                          
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                            
Restricted Stock Unit Settlements, Shares                 128                                          
Shares issued on conversion of preferred shares                   $ 2 $ 2                 $ (2) $ (2)                  
Shares issued on conversion of preferred shares, Shares                     93,379             (1,121)                        
Adjustment of fractional shares on reverse stock split                 (9)                                          
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                      
Shares issued on exercise of warrants 338                                   338                      
Shares issued on exercise of warrants, Shares                 50,834                                          
Shares issued 41 $ 21,343                   $ 3             41     $ 21,340                
Shares issued, Shares                 5,114     3,285,714                                    
Restricted stock unit settlements $ (1)                                   (1)                      
Restricted Stock Unit Settlements, Shares 231               145                                          
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                                          
Stock-based compensation expense 3,270                                   3,270                      
Shares issued on exercise of warrants 24                                   24                      
Shares issued on exercise of warrants, Shares                 3,709                                          
Shares issued from purchase agreement with Virtu 1,330                                   1,330                      
Shares issued from purchase agreement with Virtu, Shares                 200,000                                          
Shares issued $ 26   $ 17,882                   $ 8           26       $ 17,874              
Shares issued, Shares                 3,584       8,186,282                                  
Restricted Stock Unit Settlements, Shares 26,625               26,625                                          
Restricted stock unit settlements withheld and retired to treasury $ (47)                                   (47)                      
Restricted stock unit settlements withheld and retired to treasury, Shares                 (5,605)                                          
Shares issued under employee share purchase plan 126                                   126                      
Shares issued under employee share purchase plan, Shares                 28,892                                          
Net loss (42,350)                                                         (42,350)
Ending Balance at Dec. 31, 2022 $ 8,303               $ 87                   $ 144,148                   $ 4 $ (135,936)
Ending Balance, Shares at Dec. 31, 2022                 17,897,029