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Condensed Consolidated Statements of Changes in Redeemable Convertible Preferred Stock and Stockholders’ Equity (Deficit) - USD ($)
$ in Thousands
Total
Common stock
Additional paid-in capital
Accumulated deficit
Redeemable convertible preferred stock at beginning of period (in shares) at Dec. 31, 2019 31,755,000      
Redeemable convertible preferred stock balance at beginning of period at Dec. 31, 2019 $ 100,774      
Redeemable
convertible preferred
stock        
Accretion of preferred stock to redemption value $ 23      
Redeemable convertible preferred stock at end of period (in shares) at Mar. 31, 2020 31,755,000      
Redeemable convertible preferred stock balance at end of period at Mar. 31, 2020 $ 100,797      
Common stock at beginning of period (in shares) at Dec. 31, 2019   13,332,000    
Stockholder's equity at beginning of period at Dec. 31, 2019 (74,353) $ 67 $ 5,827 $ (80,247)
Stockholders' Equity        
Accretion to redemption value (23)   (23)  
Exercise of stock options (in shares)   9,000    
Exercise of stock options 8   8  
Repurchase of common stock related to net share settlement (in shares)   (4,000)    
Repurchase of common stock related to net share settlement (31)   (31)  
Stock compensation expense 489   489  
Net loss (11,236)     (11,236)
Common stock at end of period (in shares) at Mar. 31, 2020   13,337,000    
Stockholder's equity at end of period at Mar. 31, 2020 $ (85,146) $ 67 6,270 (91,483)
Redeemable convertible preferred stock at beginning of period (in shares) at Dec. 31, 2019 31,755,000      
Redeemable convertible preferred stock balance at beginning of period at Dec. 31, 2019 $ 100,774      
Redeemable
convertible preferred
stock        
Accretion of preferred stock to redemption value $ 67      
Redeemable convertible preferred stock at end of period (in shares) at Sep. 30, 2020 35,592,000      
Redeemable convertible preferred stock balance at end of period at Sep. 30, 2020 $ 157,777      
Common stock at beginning of period (in shares) at Dec. 31, 2019   13,332,000    
Stockholder's equity at beginning of period at Dec. 31, 2019 (74,353) $ 67 5,827 (80,247)
Stockholders' Equity        
Net loss (19,882)      
Common stock at end of period (in shares) at Sep. 30, 2020   13,444,000    
Stockholder's equity at end of period at Sep. 30, 2020 $ (92,608) $ 68 7,452 (100,128)
Redeemable convertible preferred stock at beginning of period (in shares) at Mar. 31, 2020 31,755,000      
Redeemable convertible preferred stock balance at beginning of period at Mar. 31, 2020 $ 100,797      
Redeemable
convertible preferred
stock        
Accretion of preferred stock to redemption value $ 22      
Redeemable convertible preferred stock at end of period (in shares) at Jun. 30, 2020 31,755,000      
Redeemable convertible preferred stock balance at end of period at Jun. 30, 2020 $ 100,819      
Common stock at beginning of period (in shares) at Mar. 31, 2020   13,337,000    
Stockholder's equity at beginning of period at Mar. 31, 2020 (85,146) $ 67 6,270 (91,483)
Stockholders' Equity        
Accretion to redemption value (22)   (22)  
Exercise of stock options (in shares)   4,000    
Exercise of stock options 9   9  
Repurchase of common stock related to net share settlement (in shares)   (3,000)    
Repurchase of common stock related to net share settlement (27)   (27)  
Stock compensation expense 504   504  
Net loss (5,476)     (5,476)
Common stock at end of period (in shares) at Jun. 30, 2020   13,338,000    
Stockholder's equity at end of period at Jun. 30, 2020 $ (90,158) $ 67 6,734 (96,959)
Redeemable
convertible preferred
stock        
Issuance of Series F redeemable convertible preferred stock, net of issuance costs (in shares) 3,837,000      
Issuance of Series F redeemable convertible preferred stock, net of issuance costs $ 56,936      
Accretion of preferred stock to redemption value $ 22      
Redeemable convertible preferred stock at end of period (in shares) at Sep. 30, 2020 35,592,000      
Redeemable convertible preferred stock balance at end of period at Sep. 30, 2020 $ 157,777      
Stockholders' Equity        
Accretion to redemption value (22)   (22)  
Exercise of stock options (in shares)   109,000    
Exercise of stock options 264 $ 1 263  
Repurchase of common stock related to net share settlement (in shares)   (3,000)    
Repurchase of common stock related to net share settlement (27)   (27)  
Stock compensation expense 504   504  
Net loss (3,169)     (3,169)
Common stock at end of period (in shares) at Sep. 30, 2020   13,444,000    
Stockholder's equity at end of period at Sep. 30, 2020 $ (92,608) $ 68 7,452 (100,128)
Redeemable convertible preferred stock at beginning of period (in shares) at Dec. 31, 2020 35,793,000      
Redeemable convertible preferred stock balance at beginning of period at Dec. 31, 2020 $ 160,800      
Redeemable
convertible preferred
stock        
Accretion of preferred stock to redemption value $ 26      
Redeemable convertible preferred stock at end of period (in shares) at Mar. 31, 2021 35,793,000      
Redeemable convertible preferred stock balance at end of period at Mar. 31, 2021 $ 160,826      
Common stock at beginning of period (in shares) at Dec. 31, 2020 13,533,000 13,533,000    
Stockholder's equity at beginning of period at Dec. 31, 2020 $ (94,923) $ 68 8,129 (103,120)
Stockholders' Equity        
Accretion to redemption value (26)   (26)  
Exercise of stock options (in shares)   56,000    
Exercise of stock options 222   222  
Repurchase of common stock related to net share settlement (in shares)   (4,000)    
Repurchase of common stock related to net share settlement (50)   (50)  
Stock compensation expense 490   490  
Net loss (2,928)     (2,928)
Common stock at end of period (in shares) at Mar. 31, 2021   13,585,000    
Stockholder's equity at end of period at Mar. 31, 2021 $ (97,215) $ 68 8,765 (106,048)
Redeemable convertible preferred stock at beginning of period (in shares) at Dec. 31, 2020 35,793,000      
Redeemable convertible preferred stock balance at beginning of period at Dec. 31, 2020 $ 160,800      
Redeemable
convertible preferred
stock        
Accretion of preferred stock to redemption value $ 56      
Redeemable convertible preferred stock at end of period (in shares) at Sep. 30, 2021 0      
Redeemable convertible preferred stock balance at end of period at Sep. 30, 2021 $ 0      
Common stock at beginning of period (in shares) at Dec. 31, 2020 13,533,000 13,533,000    
Stockholder's equity at beginning of period at Dec. 31, 2020 $ (94,923) $ 68 8,129 (103,120)
Stockholders' Equity        
Exercise of stock options (in shares) 641,000      
Net loss $ (15,236)      
Common stock at end of period (in shares) at Sep. 30, 2021 57,557,000 57,557,000    
Stockholder's equity at end of period at Sep. 30, 2021 $ 273,988 $ 288 392,056 (118,356)
Redeemable convertible preferred stock at beginning of period (in shares) at Mar. 31, 2021 35,793,000      
Redeemable convertible preferred stock balance at beginning of period at Mar. 31, 2021 $ 160,826      
Redeemable
convertible preferred
stock        
Accretion of preferred stock to redemption value $ 25      
Redeemable convertible preferred stock at end of period (in shares) at Jun. 30, 2021 35,793,000      
Redeemable convertible preferred stock balance at end of period at Jun. 30, 2021 $ 160,851      
Common stock at beginning of period (in shares) at Mar. 31, 2021   13,585,000    
Stockholder's equity at beginning of period at Mar. 31, 2021 (97,215) $ 68 8,765 (106,048)
Stockholders' Equity        
Accretion to redemption value (25)   (25)  
Exercise of stock options (in shares)   262,000    
Exercise of stock options 613 $ 2 611  
Repurchase of common stock related to net share settlement (in shares)   (3,000)    
Repurchase of common stock related to net share settlement (57)   (57)  
Issuance of RSA's (in shares)   201,000    
Issuance of RSAs 0 $ 1 (1)  
Stock compensation expense 972   972  
Net loss (3,083)     (3,083)
Common stock at end of period (in shares) at Jun. 30, 2021   14,045,000    
Stockholder's equity at end of period at Jun. 30, 2021 (98,795) $ 71 10,265 (109,131)
Redeemable
convertible preferred
stock        
Accretion of preferred stock to redemption value $ 5      
Conversion of convertible preferred stock (in shares) (35,793,000)      
Conversion of redeemable convertible preferred stock $ (160,856)      
Redeemable convertible preferred stock at end of period (in shares) at Sep. 30, 2021 0      
Redeemable convertible preferred stock balance at end of period at Sep. 30, 2021 $ 0      
Stockholders' Equity        
Accretion to redemption value (5)   (5)  
Exercise of stock options (in shares)   222,000    
Exercise of stock options 762 $ 1 761  
Repurchase of common stock related to net share settlement (in shares)   (3,000)    
Repurchase of common stock related to net share settlement (189)   (189)  
Issuance of common stock upon initial public offering, net of underwriting discounts and commissions and other offering costs (in shares)   7,500,000    
Issuance of common stock upon initial public offering, net of underwriting discounts and commissions and other offering costs 219,527 $ 37 219,490  
Conversion of redeemable convertible preferred stock (in shares)   35,793,000    
Conversion of redeemable convertible preferred stock 160,856 $ 179 160,677  
Stock compensation expense 1,057   1,057  
Net loss $ (9,225)     (9,225)
Common stock at end of period (in shares) at Sep. 30, 2021 57,557,000 57,557,000    
Stockholder's equity at end of period at Sep. 30, 2021 $ 273,988 $ 288 $ 392,056 $ (118,356)