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Condensed Statements of Redeemable Convertible Preferred Stock and Stockholders’ Equity (Deficit) - USD ($)
$ in Thousands
Total
Redeemable Convertible Preferred Stock
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Loss
Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2020   16,614,178        
Beginning balance at Dec. 31, 2020   $ 141,422        
Ending balance (in shares) at Mar. 31, 2021   16,614,178        
Ending balance at Mar. 31, 2021   $ 141,422        
Beginning balance (in shares) at Dec. 31, 2020     314,096      
Beginning balance at Dec. 31, 2020 $ (147,832)   $ 0 $ 239,826 $ 33 $ (387,691)
Increase (Decrease) in Stockholders' Equity            
Net loss (8,810)         (8,810)
Issuance of common stock pursuant to stock option exercises (in shares)     156,538      
Issuance of common stock pursuant to stock option exercises 4     4    
Stock-based compensation 202     202    
Ending balance (in shares) at Mar. 31, 2021     470,634      
Ending balance at Mar. 31, 2021 $ (156,436)   $ 0 240,032 33 (396,501)
Beginning balance (in shares) at Dec. 31, 2021   0        
Ending balance (in shares) at Mar. 31, 2022   0        
Beginning balance (in shares) at Dec. 31, 2021 24,452,999   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 gain (loss) on available-for-sale debt securities $ (710)       (710)  
Issuance of common stock pursuant to stock option exercises (in shares) 38,635   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   24,477,180      
Ending balance at Mar. 31, 2022 $ 62,823   $ 24 $ 499,013 $ (982) $ (435,232)