Quarterly report pursuant to Section 13 or 15(d)

CONDENSED STATEMENTS OF STOCKHOLDERS??? EQUITY (UNAUDITED)

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CONDENSED STATEMENTS OF STOCKHOLDERS’ EQUITY (UNAUDITED) - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Beginning balance (shares) at Dec. 31, 2019   99,416    
Beginning balance at Dec. 31, 2019 $ 29,147 $ 10 $ 70,774 $ (41,637)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of common stock from exercise of stock options (shares)   436    
Issuance of common stock from exercise of stock options 161   161  
Stock-based compensation 1,258   1,258  
Net loss (5,152)     (5,152)
Ending balance (shares) at Mar. 31, 2020   99,852    
Ending balance at Mar. 31, 2020 25,414 $ 10 72,193 (46,789)
Beginning balance (shares) at Dec. 31, 2019   99,416    
Beginning balance at Dec. 31, 2019 29,147 $ 10 70,774 (41,637)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net loss (12,990)      
Ending balance (shares) at Sep. 30, 2020   100,029    
Ending balance at Sep. 30, 2020 19,449 $ 10 74,066 (54,627)
Beginning balance (shares) at Mar. 31, 2020   99,852    
Beginning balance at Mar. 31, 2020 25,414 $ 10 72,193 (46,789)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of common stock from exercise of stock options (shares)   34    
Issuance of common stock from exercise of stock options 12   12  
Stock-based compensation 1,243   1,243  
Net loss (4,681)     (4,681)
Ending balance (shares) at Jun. 30, 2020   99,886    
Ending balance at Jun. 30, 2020 21,988 $ 10 73,448 (51,470)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of common stock from exercise of stock options (shares)   143    
Issuance of common stock from exercise of stock options 3   3  
Stock-based compensation 615   615  
Net loss (3,157)     (3,157)
Ending balance (shares) at Sep. 30, 2020   100,029    
Ending balance at Sep. 30, 2020 19,449 $ 10 74,066 (54,627)
Beginning balance (shares) at Dec. 31, 2020   100,664    
Beginning balance at Dec. 31, 2020 11,212 $ 10 75,123 (63,921)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of common stock under equity commitment (shares)   6,127    
Issuance of common stock under equity commitment 3,222 $ 1 3,221  
Stock-based compensation 657   657  
Net loss (3,127)     (3,127)
Ending balance (shares) at Mar. 31, 2021   106,791    
Ending balance at Mar. 31, 2021 11,964 $ 11 79,001 (67,048)
Beginning balance (shares) at Dec. 31, 2020   100,664    
Beginning balance at Dec. 31, 2020 11,212 $ 10 75,123 (63,921)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net loss (6,697)      
Ending balance (shares) at Sep. 30, 2021   109,946    
Ending balance at Sep. 30, 2021 11,142 $ 11 81,749 (70,618)
Beginning balance (shares) at Mar. 31, 2021   106,791    
Beginning balance at Mar. 31, 2021 11,964 $ 11 79,001 (67,048)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of common stock from exercise of stock options (shares)   2    
Issuance of common stock from exercise of stock options 0   0  
Issuance of common stock under equity commitment (shares)   1,669    
Issuance of common stock under equity commitment 631 $ 0 631  
Stock-based compensation 912   912  
Net loss (3,530)     (3,530)
Ending balance (shares) at Jun. 30, 2021   108,462    
Ending balance at Jun. 30, 2021 9,977 $ 11 80,544 (70,578)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of common stock under equity commitment (shares)   1,484    
Issuance of common stock under equity commitment 399   399  
Stock-based compensation 806   806  
Net loss (40)     (40)
Ending balance (shares) at Sep. 30, 2021   109,946    
Ending balance at Sep. 30, 2021 $ 11,142 $ 11 $ 81,749 $ (70,618)