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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 Jun. 30, 2022 0            
Ending balance at Jun. 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 (3,806)           (3,806)
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)     9,579        
Vesting of restricted stock units, net of withholding tax and shares issued under employee stock purchase plan 0            
Stock-based compensation 2,056       2,056    
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 Jun. 30, 2022     3,222,534        
Ending balance at Jun. 30, 2022 $ 48,357   $ 0   691,688   (643,331)
Ending balance (in shares) at Jun. 30, 2022 0            
Ending balance at Jun. 30, 2022 $ 0            
Beginning balance (shares) at Mar. 31, 2022     3,217,138        
Beginning balance at Mar. 31, 2022 55,731   $ 0   690,586   (634,855)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net loss (8,476)           (8,476)
Vesting of restricted stock units, net of withholding tax and shares issued under employee stock purchase plan (in shares)     5,396        
Vesting of restricted stock units, net of withholding tax and shares issued under employee stock purchase plan 25       25    
Stock-based compensation 1,163       1,163    
Issuance of common stock, net of issuance costs   (86)       $ (86)  
Ending balance (shares) at Jun. 30, 2022     3,222,534        
Ending balance at Jun. 30, 2022 $ 48,357   $ 0   691,688   (643,331)
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 Jun. 30, 2023 0            
Ending balance at Jun. 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 (15,680)           (15,680)
Vesting of restricted stock units, net of withholding tax and shares issued under employee stock purchase plan (in shares)     18,186        
Vesting of restricted stock units, net of withholding tax and shares issued under employee stock purchase plan 11       11    
Stock-based compensation 1,732       1,732    
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 Jun. 30, 2023 3,282,479   3,282,479        
Ending balance at Jun. 30, 2023 $ 17,272   $ 0   695,836   (678,564)
Ending balance (in shares) at Jun. 30, 2023 0            
Ending balance at Jun. 30, 2023 $ 0            
Beginning balance (shares) at Mar. 31, 2023     3,271,282        
Beginning balance at Mar. 31, 2023 26,431   $ 0   694,937   (668,506)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net loss (10,058)           (10,058)
Vesting of restricted stock units, net of withholding tax and shares issued under employee stock purchase plan (in shares)     11,197        
Vesting of restricted stock units, net of withholding tax and shares issued under employee stock purchase plan 23       23    
Stock-based compensation $ 876       876    
Ending balance (shares) at Jun. 30, 2023 3,282,479   3,282,479        
Ending balance at Jun. 30, 2023 $ 17,272   $ 0   $ 695,836   $ (678,564)