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Condensed Consolidated Statements of Changes in Redeemable Convertible Preferred Stock and Stockholders’ Deficit - USD ($)
shares in Thousands, $ 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      
Redeemable convertible preferred stock balance at beginning of period at Dec. 31, 2019 $ 100,774      
Increase (Decrease) in Temporary Equity [Roll Forward]        
Accretion of preferred stock to redemption value $ 23      
Redeemable convertible preferred stock at end of period (in shares) at Mar. 31, 2020 31,755      
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    
Stockholder's equity at beginning of period at Dec. 31, 2019 (74,353) $ 67 $ 5,827 $ (80,247)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Accretion to redemption value (23)   (23)  
Exercise of stock options (in shares)   9    
Exercise of stock options 8   8  
Repurchase of common stock related to net share settlement (in shares)   (4)    
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    
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      
Redeemable convertible preferred stock balance at beginning of period at Dec. 31, 2019 $ 100,774      
Increase (Decrease) in Temporary Equity [Roll Forward]        
Accretion of preferred stock to redemption value $ 45      
Redeemable convertible preferred stock at end of period (in shares) at Jun. 30, 2020 31,755      
Redeemable convertible preferred stock balance at end of period at Jun. 30, 2020 $ 100,819      
Common stock at beginning of period (in shares) at Dec. 31, 2019   13,332    
Stockholder's equity at beginning of period at Dec. 31, 2019 (74,353) $ 67 5,827 (80,247)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net loss (16,713)      
Common stock at end of period (in shares) at Jun. 30, 2020   13,338    
Stockholder's equity at end of period at Jun. 30, 2020 $ (90,158) $ 67 6,734 (96,959)
Redeemable convertible preferred stock at beginning of period (in shares) at Mar. 31, 2020 31,755      
Redeemable convertible preferred stock balance at beginning of period at Mar. 31, 2020 $ 100,797      
Increase (Decrease) in Temporary Equity [Roll Forward]        
Accretion of preferred stock to redemption value $ 22      
Redeemable convertible preferred stock at end of period (in shares) at Jun. 30, 2020 31,755      
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    
Stockholder's equity at beginning of period at Mar. 31, 2020 (85,146) $ 67 6,270 (91,483)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Accretion to redemption value (22)   (22)  
Exercise of stock options (in shares)   4    
Exercise of stock options 9   9  
Repurchase of common stock related to net share settlement (in shares)   (3)    
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    
Stockholder's equity at end of period at Jun. 30, 2020 $ (90,158) $ 67 6,734 (96,959)
Redeemable convertible preferred stock at beginning of period (in shares) at Dec. 31, 2020 35,793      
Redeemable convertible preferred stock balance at beginning of period at Dec. 31, 2020 $ 160,800      
Increase (Decrease) in Temporary Equity [Roll Forward]        
Accretion of preferred stock to redemption value $ 26      
Redeemable convertible preferred stock at end of period (in shares) at Mar. 31, 2021 35,793      
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 13,533    
Stockholder's equity at beginning of period at Dec. 31, 2020 $ (94,923) $ 68 8,129 (103,120)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Accretion to redemption value (26)   (26)  
Exercise of stock options (in shares)   56    
Exercise of stock options 222   222  
Repurchase of common stock related to net share settlement (in shares)   (4)    
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    
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      
Redeemable convertible preferred stock balance at beginning of period at Dec. 31, 2020 $ 160,800      
Increase (Decrease) in Temporary Equity [Roll Forward]        
Accretion of preferred stock to redemption value $ 51      
Redeemable convertible preferred stock at end of period (in shares) at Jun. 30, 2021 35,793      
Redeemable convertible preferred stock balance at end of period at Jun. 30, 2021 $ 160,851      
Common stock at beginning of period (in shares) at Dec. 31, 2020 13,533 13,533    
Stockholder's equity at beginning of period at Dec. 31, 2020 $ (94,923) $ 68 8,129 (103,120)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Exercise of stock options (in shares) 419      
Net loss $ (6,011)      
Common stock at end of period (in shares) at Jun. 30, 2021 14,045 14,045    
Stockholder's equity at end of period at Jun. 30, 2021 $ (98,795) $ 71 10,265 (109,131)
Redeemable convertible preferred stock at beginning of period (in shares) at Mar. 31, 2021 35,793      
Redeemable convertible preferred stock balance at beginning of period at Mar. 31, 2021 $ 160,826      
Increase (Decrease) in Temporary Equity [Roll Forward]        
Accretion of preferred stock to redemption value $ 25      
Redeemable convertible preferred stock at end of period (in shares) at Jun. 30, 2021 35,793      
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    
Stockholder's equity at beginning of period at Mar. 31, 2021 (97,215) $ 68 8,765 (106,048)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Accretion to redemption value (25)   (25)  
Exercise of stock options (in shares)   262    
Exercise of stock options 613 $ 2 611  
Repurchase of common stock related to net share settlement (in shares)   (3)    
Repurchase of common stock related to net share settlement (57)   (57)  
Issuance of RSA's (in shares)   201    
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 14,045    
Stockholder's equity at end of period at Jun. 30, 2021 $ (98,795) $ 71 $ 10,265 $ (109,131)