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Condensed Statements of Stockholders’ Equity (unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Loss
Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2021   24,452,999      
Beginning balance at Dec. 31, 2021 $ 73,503 $ 24 $ 497,522 $ (272) $ (423,771)
Increase (Decrease) in Stockholders' Equity          
Net loss (11,461)       (11,461)
Unrealized loss on available-for-sale debt securities (710)     (710)  
Issuance of common stock pursuant to stock option exercises (in shares)   38,635      
Issuance of common stock pursuant to stock option exercises 1   1    
Repurchase of common stock (in shares)   (14,454)      
Change in early exercise liability 2   2    
Stock-based compensation 1,488   1,488    
Ending balance (in shares) at Mar. 31, 2022   24,477,180      
Ending balance at Mar. 31, 2022 $ 62,823 $ 24 499,013 (982) (435,232)
Beginning balance (in shares) at Dec. 31, 2022 25,045,751 25,045,751      
Beginning balance at Dec. 31, 2022 $ 34,777 $ 25 506,713 (1,108) (470,853)
Increase (Decrease) in Stockholders' Equity          
Net loss (10,375)       (10,375)
Unrealized loss adjustment for short-term investment 1,108     1,108  
Unrealized loss on available-for-sale debt securities $ 0        
Issuance of common stock pursuant to stock option exercises (in shares) 17,608 17,608      
Issuance of common stock pursuant to stock option exercises $ 1   1    
Issuance of common stock upon vesting of restricted stock units (in shares)   325,747      
Shares withheld for taxes (in shares)   (35,562)      
Shares withheld for taxes (146)   (146)    
Repurchase of common stock (in shares)   (1,340)      
Stock-based compensation $ 2,125   2,125    
Ending balance (in shares) at Mar. 31, 2023 25,352,204 25,352,204      
Ending balance at Mar. 31, 2023 $ 27,490 $ 25 $ 508,693 $ 0 $ (481,228)