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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN MEZZANINE EQUITY AND STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
At-the-market Offering
Common stock
Common stock
At-the-market Offering
Additional paid-in capital
Additional paid-in capital
At-the-market Offering
Accumulated deficit
Beginning balance (in shares) at Dec. 31, 2021 0            
Beginning balance at Dec. 31, 2021 $ 0            
Ending balance (in shares) at Sep. 30, 2022 0            
Ending balance at Sep. 30, 2022 $ 0            
Beginning balance (shares) at Dec. 31, 2021     2,976,541        
Beginning balance at Dec. 31, 2021 48,636   $ 5   $ 688,156   $ (639,525)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net loss (13,265)           (13,265)
Reclassification due to reverse stock split 0   $ (5)   5    
Vesting of restricted stock units, net of withholding tax and shares issued under employee stock purchase plan (in shares)     11,258        
Vesting of restricted stock units, net of withholding tax and shares issued under employee stock purchase plan (3)       (3)    
Stock-based compensation 3,230       3,230    
Issuance of commitment shares (in shares)     92,644        
Issuance of commitment shares 0            
Issuance of common stock, net of issuance costs (in shares)       143,770      
Issuance of common stock, net of issuance costs   $ 1,471       $ 1,471  
Ending balance (shares) at Sep. 30, 2022     3,224,213        
Ending balance at Sep. 30, 2022 $ 40,069   $ 0   692,859   (652,790)
Beginning balance (in shares) at Jun. 30, 2022 0            
Beginning balance at Jun. 30, 2022 $ 0            
Ending balance (in shares) at Sep. 30, 2022 0            
Ending balance at Sep. 30, 2022 $ 0            
Beginning balance (shares) at Jun. 30, 2022     3,222,534        
Beginning balance at Jun. 30, 2022 48,358   $ 0   691,688   (643,331)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net loss (9,459)           (9,459)
Vesting of restricted stock units, net of withholding tax and shares issued under employee stock purchase plan (in shares)     1,678        
Vesting of restricted stock units, net of withholding tax and shares issued under employee stock purchase plan (3)       (3)    
Stock-based compensation 1,174       1,174    
Ending balance (shares) at Sep. 30, 2022     3,224,213        
Ending balance at Sep. 30, 2022 $ 40,069   $ 0   692,859   (652,790)
Beginning balance (in shares) at Dec. 31, 2022 3,000            
Beginning balance at Dec. 31, 2022 $ 211            
Increase (Decrease) in Temporary Equity [Roll Forward]              
Redemption of convertible preferred stock ( in shares) (3,000)            
Redemption of convertible preferred stock $ (211)            
Ending balance (in shares) at Sep. 30, 2023 0            
Ending balance at Sep. 30, 2023 $ 0            
Beginning balance (shares) at Dec. 31, 2022 3,229,704   3,229,704        
Beginning balance at Dec. 31, 2022 $ 31,202   $ 0   693,937   (662,735)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net loss (22,264)           (22,264)
Vesting of restricted stock units, net of withholding tax and shares issued under employee stock purchase plan (in shares)     40,488        
Vesting of restricted stock units, net of withholding tax and shares issued under employee stock purchase plan (35)       (35)    
Stock-based compensation 2,595       2,595    
Redemption of convertible preferred stock $ (149)           (149)
Issuance of common stock, net of issuance costs (in shares)       34,589      
Issuance of common stock, net of issuance costs   $ 156       $ 156  
Ending balance (shares) at Sep. 30, 2023 3,304,781   3,304,781        
Ending balance at Sep. 30, 2023 $ 11,505   $ 0   696,653   (685,148)
Beginning balance (in shares) at Jun. 30, 2023 0            
Beginning balance at Jun. 30, 2023 $ 0            
Ending balance (in shares) at Sep. 30, 2023 0            
Ending balance at Sep. 30, 2023 $ 0            
Beginning balance (shares) at Jun. 30, 2023     3,282,479        
Beginning balance at Jun. 30, 2023 17,272   $ 0   695,836   (678,564)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net loss (6,584)           (6,584)
Vesting of restricted stock units, net of withholding tax and shares issued under employee stock purchase plan (in shares)     22,302        
Vesting of restricted stock units, net of withholding tax and shares issued under employee stock purchase plan (46)       (46)    
Stock-based compensation $ 863       863    
Ending balance (shares) at Sep. 30, 2023 3,304,781   3,304,781        
Ending balance at Sep. 30, 2023 $ 11,505   $ 0   $ 696,653   $ (685,148)