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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY (DEFICIT) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Series A
Series A-1
Series B Preferred Stock
Preferred Stock
Common Class A
Common Stock
Common Class B
Common Stock
Beginning balance (in shares) at Dec. 31, 2018         3,379,400 0      
Beginning balance at Dec. 31, 2018         $ 7,789 $ 0      
Increase (Decrease) in Temporary Equity [Roll Forward]                  
Conversion of Preferred Stock (in shares)           (1,837,600)      
Conversion of Preferred Stock           $ (10,270)      
Ending balance (in shares) at Dec. 31, 2019         3,379,400 1,837,600      
Ending balance at Dec. 31, 2019         $ 7,789 $ 10,270      
Beginning balance (in shares) at Dec. 31, 2018   94,469,400         4,681,400    
Beginning balance at Dec. 31, 2018 $ 8,406 $ 0 $ 3,043 $ (18,637)     $ 24,000    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Stock-based compensation expense 504   504            
Issuance of common stock upon exercise of stock options (in shares)   123,300              
Issuance of common stock upon exercise of stock options 97   97            
Net loss (10,166)     (10,166)          
Ending balance (in shares) at Dec. 31, 2019   94,592,700         4,681,400 0 0
Ending balance at Dec. 31, 2019 (1,159) $ 0 3,644 (28,803)     $ 24,000 $ 0 $ 0
Ending balance (in shares) at Mar. 31, 2020         3,379,400 1,837,600      
Ending balance at Mar. 31, 2020         $ 7,789 $ 10,270      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Stock-based compensation expense 205   205            
Net loss (1,931)     (1,931)          
Ending balance (in shares) at Mar. 31, 2020   94,592,700         4,681,400 0 0
Ending balance at Mar. 31, 2020 (2,885) $ 0 3,849 (30,734)     $ 24,000 $ 0 $ 0
Beginning balance (in shares) at Dec. 31, 2019         3,379,400 1,837,600      
Beginning balance at Dec. 31, 2019         $ 7,789 $ 10,270      
Ending balance (in shares) at Sep. 30, 2020         3,379,400 1,837,600      
Ending balance at Sep. 30, 2020         $ 7,789 $ 10,270      
Beginning balance (in shares) at Dec. 31, 2019   94,592,700         4,681,400 0 0
Beginning balance at Dec. 31, 2019 (1,159) $ 0 3,644 (28,803)     $ 24,000 $ 0 $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net loss (5,075)                
Ending balance (in shares) at Sep. 30, 2020   94,592,700         4,681,400 0 0
Ending balance at Sep. 30, 2020 (5,562) $ 0 4,316 (33,878)     $ 24,000 $ 0 $ 0
Beginning balance (in shares) at Dec. 31, 2019         3,379,400 1,837,600      
Beginning balance at Dec. 31, 2019         $ 7,789 $ 10,270      
Ending balance (in shares) at Dec. 31, 2020         3,379,400 1,837,600      
Ending balance at Dec. 31, 2020         $ 7,789 $ 10,270      
Beginning balance (in shares) at Dec. 31, 2019   94,592,700         4,681,400 0 0
Beginning balance at Dec. 31, 2019 (1,159) $ 0 3,644 (28,803)     $ 24,000 $ 0 $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Stock-based compensation expense $ 1,079   1,079            
Issuance of common stock upon exercise of stock options (in shares) 457,341 457,341              
Issuance of common stock upon exercise of stock options $ 252   252            
Net loss (7,012)     (7,012)          
Ending balance (in shares) at Dec. 31, 2020   95,050,041         4,681,400 0 0
Ending balance at Dec. 31, 2020 (6,840) $ 0 4,975 (35,815)     $ 24,000 $ 0 $ 0
Beginning balance (in shares) at Mar. 31, 2020         3,379,400 1,837,600      
Beginning balance at Mar. 31, 2020         $ 7,789 $ 10,270      
Ending balance (in shares) at Jun. 30, 2020         3,379,400 1,837,600      
Ending balance at Jun. 30, 2020         $ 7,789 $ 10,270      
Beginning balance (in shares) at Mar. 31, 2020   94,592,700         4,681,400 0 0
Beginning balance at Mar. 31, 2020 (2,885) $ 0 3,849 (30,734)     $ 24,000 $ 0 $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Stock-based compensation expense 209   209            
Net loss (2,108)     (2,108)          
Ending balance (in shares) at Jun. 30, 2020   94,592,700         4,681,400 0 0
Ending balance at Jun. 30, 2020 (4,784) $ 0 4,058 (32,842)     $ 24,000 $ 0 $ 0
Ending balance (in shares) at Sep. 30, 2020         3,379,400 1,837,600      
Ending balance at Sep. 30, 2020         $ 7,789 $ 10,270      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Stock-based compensation expense 258   258            
Net loss (1,036)     (1,036)          
Ending balance (in shares) at Sep. 30, 2020   94,592,700         4,681,400 0 0
Ending balance at Sep. 30, 2020 (5,562) $ 0 4,316 (33,878)     $ 24,000 $ 0 $ 0
Beginning balance (in shares) at Dec. 31, 2020         3,379,400 1,837,600      
Beginning balance at Dec. 31, 2020         $ 7,789 $ 10,270      
Increase (Decrease) in Temporary Equity [Roll Forward]                  
Conversion of Preferred Stock (in shares)         (3,379,400) (1,837,600)      
Conversion of Preferred Stock         $ (7,789) $ (10,270)      
Ending balance (in shares) at Mar. 31, 2021         0 0      
Ending balance at Mar. 31, 2021         $ 0 $ 0      
Beginning balance (in shares) at Dec. 31, 2020   95,050,041         4,681,400 0 0
Beginning balance at Dec. 31, 2020 (6,840) $ 0 4,975 (35,815)     $ 24,000 $ 0 $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Stock-based compensation expense 593   593            
Conversion of preferred and common stock (in shares)   29,695,200         (4,681,400)    
Stock Issued During Period, Value, Conversion of Convertible Securities 18,058   42,058       $ (24,000)    
Issuance of Class A Common Stock in connection with the Initial Public Offering, net of issuance costs (in shares)               10,000,000  
Issuance of Class A Common Stock in connection with the Initial Public Offering, net of issuance costs 126,622   126,622            
Reclassification of Common Stock to Class B Common Stock in connection with the Initial Public Offering (in shares)   (124,745,241)             124,745,241
Reclassification of Common Stock to Class B Common Stock in connection with the initial public offering 0   (1)           $ 1
Issuance of common stock upon exercise of stock options (in shares)                 3,861
Issuance of common stock upon exercise of stock options 7   7            
Net loss 1,471     1,471          
Ending balance (in shares) at Mar. 31, 2021   0         0 10,000,000 124,749,102
Ending balance at Mar. 31, 2021 139,911 $ 0 174,254 (34,344)     $ 0 $ 0 $ 1
Beginning balance (in shares) at Dec. 31, 2020         3,379,400 1,837,600      
Beginning balance at Dec. 31, 2020         $ 7,789 $ 10,270      
Ending balance (in shares) at Sep. 30, 2021         0 0      
Ending balance at Sep. 30, 2021         $ 0 $ 0      
Beginning balance (in shares) at Dec. 31, 2020   95,050,041         4,681,400 0 0
Beginning balance at Dec. 31, 2020 $ (6,840) $ 0 4,975 (35,815)     $ 24,000 $ 0 $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Issuance of common stock upon exercise of stock options (in shares) 577,153                
Net loss $ 577                
Ending balance (in shares) at Sep. 30, 2021   0         0 21,986,619 114,105,779
Ending balance at Sep. 30, 2021 150,055 $ 0 185,292 (35,238)     $ 0 $ 0 $ 1
Beginning balance (in shares) at Mar. 31, 2021         0 0      
Beginning balance at Mar. 31, 2021         $ 0 $ 0      
Ending balance (in shares) at Jun. 30, 2021         0 0      
Ending balance at Jun. 30, 2021         $ 0 $ 0      
Beginning balance (in shares) at Mar. 31, 2021   0         0 10,000,000 124,749,102
Beginning balance at Mar. 31, 2021 139,911 $ 0 174,254 (34,344)     $ 0 $ 0 $ 1
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Stock-based compensation expense 569   569            
Conversion of preferred and common stock (in shares)               81,102 (81,102)
Issuance of Class A Common Stock in connection with the Initial Public Offering, net of issuance costs (in shares)               719,266  
Issuance of Class A Common Stock in connection with the Initial Public Offering, net of issuance costs 9,245   9,245            
Issuance of common stock upon exercise of stock options (in shares)                 28,442
Issuance of common stock upon exercise of stock options 19   19            
Net loss (279)                
Ending balance (in shares) at Jun. 30, 2021   0         0 10,800,368 124,696,442
Ending balance at Jun. 30, 2021 149,465 $ 0 184,087 (34,623)     $ 0 $ 0 $ 1
Ending balance (in shares) at Sep. 30, 2021         0 0      
Ending balance at Sep. 30, 2021         $ 0 $ 0      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Stock-based compensation expense 627   627            
Conversion of preferred and common stock (in shares)               11,186,251 (11,186,251)
Issuance of common stock upon exercise of stock options (in shares)                 543,826
Issuance of common stock upon exercise of stock options 578   578            
Vesting of Class B Common Stock in connection with Restricted Stock Awards (in shares)                 51,762
Net loss (615)     (615)          
Ending balance (in shares) at Sep. 30, 2021   0         0 21,986,619 114,105,779
Ending balance at Sep. 30, 2021 $ 150,055 $ 0 $ 185,292 $ (35,238)     $ 0 $ 0 $ 1