Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Statements of Changes in Stockholders??? Equity (Deficit) (Unaudited)

v3.23.3
Condensed Consolidated Statements of Changes in Stockholders’ Equity (Deficit) (Unaudited) - USD ($)
$ in Thousands
Total
Common stock
Additional paid-in capital
Accumulated deficit
Balance at the beginning (in shares) at Dec. 31, 2021   9,399,517    
Balance at the beginning at Dec. 31, 2021 $ 23,082 $ 9 $ 285,239 $ (262,166)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Shares purchased through employee stock purchase plan (in shares)   5,269    
Shares purchased through employee stock purchase plan 25   25  
Restricted stock units vested during period (in shares)   938    
Impact of reverse stock split fractional share round-up (in shares)   8,380    
Stock-based compensation 6,711   6,711  
Net loss (31,846)     (31,846)
Balance at the end (in shares) at Sep. 30, 2022   9,414,104    
Balance at the end at Sep. 30, 2022 (2,028) $ 9 291,975 (294,012)
Balance at the beginning (in shares) at Jun. 30, 2022   9,405,724    
Balance at the beginning at Jun. 30, 2022 (5,951) $ 9 291,244 (297,204)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Impact of reverse stock split fractional share round-up (in shares)   8,380    
Stock-based compensation 731   731  
Net loss 3,192     3,192
Balance at the end (in shares) at Sep. 30, 2022   9,414,104    
Balance at the end at Sep. 30, 2022 $ (2,028) $ 9 291,975 (294,012)
Balance at the beginning (in shares) at Dec. 31, 2022 9,430,535 9,430,535    
Balance at the beginning at Dec. 31, 2022 $ (10,915) $ 9 292,900 (303,824)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of common shares pursuant to ATM Program, net (in shares)   179,058,448    
Issuance of common shares pursuant to ATM Program, net 32,470 $ 179 32,291  
Exercise of pre-funded warrants for common shares (in shares)   1,403,813    
Exercise of pre-funded warrants for common shares 0 $ 1 (1)  
Issuance of shares of common stock and warrants in underwritten public offering, net (in shares)   3,770,000    
Issuance of shares of common stock and warrants in underwritten public offering, net 13,748 $ 4 13,744  
Retirement of common shares in exchange for pre-funded warrants (in shares)   (1,300,000)    
Retirement of common shares in exchange for pre-funded warrants (3,640) $ (1) (3,873) 234
Issuance of pre-funded warrants in exchange for retirement of common shares 3,640   3,640  
Shares purchased through employee stock purchase plan (in shares)   19,623    
Shares purchased through employee stock purchase plan 67   67  
Stock-based compensation 2,701   2,701  
Net loss $ (23,376)     (23,376)
Balance at the end (in shares) at Sep. 30, 2023 192,382,419 192,382,419    
Balance at the end at Sep. 30, 2023 $ 14,695 $ 192 341,469 (326,966)
Balance at the beginning (in shares) at Jun. 30, 2023   14,036,940    
Balance at the beginning at Jun. 30, 2023 (6,969) $ 14 314,755 (321,738)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of common shares pursuant to ATM Program, net (in shares)   177,013,776    
Issuance of common shares pursuant to ATM Program, net 25,939 $ 177 25,762  
Exercise of pre-funded warrants for common shares (in shares)   1,331,703    
Exercise of pre-funded warrants for common shares 0 $ 1 (1)  
Stock-based compensation 953   953  
Net loss $ (5,228)     (5,228)
Balance at the end (in shares) at Sep. 30, 2023 192,382,419 192,382,419    
Balance at the end at Sep. 30, 2023 $ 14,695 $ 192 $ 341,469 $ (326,966)