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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) (Unaudited) - USD ($)
$ in Thousands
Total
Convertible Preferred Stock [Member]
Common Stock [Member]
Common Class A [Member]
Common Class B [Member]
Additional Paid In Capital [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive Loss [Member]
I P O [Member]
I P O [Member]
Common Class A [Member]
I P O [Member]
Additional Paid In Capital [Member]
Balance at Dec. 31, 2019   $ 311,468                  
Balance, Shares at Dec. 31, 2019   110,627,173                  
Balance at Dec. 31, 2019 $ (106,142)   $ 21     $ 19,796 $ (125,958) $ (1)      
Balance, Shares at Dec. 31, 2019     21,078,342                
Issuance of Series E-1 Preferred Stock net of issuance costs of $136   $ 54,885                  
Issuance of Series E-1 Preferred Stock net of issuance costs of $136, Shares   4,642,048                  
Issuance of common stock from the exercise of stock options 1,003   $ 1     1,002          
Issuance of common stock from the exercise of stock options, Shares     866,057                
Stock-based compensation 3,473         3,473          
Other comprehensive income (loss) (6)             (6)      
Net income (loss) (28,762)           (28,762)        
Balance at Sep. 30, 2020   $ 366,353                  
Balance, Shares at Sep. 30, 2020   115,269,221                  
Balance at Sep. 30, 2020 (130,434)   $ 22     24,271 (154,720) (7)      
Balance, Shares at Sep. 30, 2020     21,944,399                
Balance at Jun. 30, 2020   $ 311,468                  
Balance, Shares at Jun. 30, 2020   110,627,173                  
Balance at Jun. 30, 2020 (134,755)   $ 21     23,111 (157,879) (8)      
Balance, Shares at Jun. 30, 2020     21,438,899                
Issuance of Series E-1 Preferred Stock net of issuance costs of $136   $ 54,885                  
Issuance of Series E-1 Preferred Stock net of issuance costs of $136, Shares   4,642,048                  
Issuance of common stock from the exercise of stock options 818   $ 1     817          
Issuance of common stock from the exercise of stock options, Shares     505,500                
Stock-based compensation 343         343          
Other comprehensive income (loss) 1             1      
Net income (loss) 3,159           3,159        
Balance at Sep. 30, 2020   $ 366,353                  
Balance, Shares at Sep. 30, 2020   115,269,221                  
Balance at Sep. 30, 2020 (130,434)   $ 22     24,271 (154,720) (7)      
Balance, Shares at Sep. 30, 2020     21,944,399                
Balance at Dec. 31, 2020   $ 366,332                  
Balance, Shares at Dec. 31, 2020   115,269,221                  
Balance at Dec. 31, 2020 (139,692)   $ 22     27,322 (166,979) (57)      
Balance, Shares at Dec. 31, 2020     22,331,842                
Issuance of common stock in connection with initial public offering, net of underwriting discounts and commissions and other offering costs                 $ 385,068 $ 17 $ 385,051
Issuance of common stock in connection with initial public offering, net of underwriting discounts and commissions and other offering costs, Shares                   16,550,000  
Issuance of common stock from the exercise of stock options $ 1,095   $ 0 $ 1 $ 0 1,094          
Issuance of common stock from the exercise of stock options, Shares 1,073,448   375,971 694,736 2,715            
Stock-based compensation $ 16,422         16,422          
Issuance of common stock for vested restricted stock units (1,329)     $ 0   (1,329)          
Issuance of common stock for vested restricted stock units, Shares       121,657              
Conversion of redeemable convertible preferred stock to common stock   $ (366,332)                  
Conversion of redeemable convertible preferred stock to common stock, Shares   (115,269,221)                  
Conversion of redeemable convertible preferred stock to common stock 366,332       $ 115 366,217          
Conversion of redeemable convertible preferred stock to common stock, Shares         115,269,221            
Sale of Common Stock to Underwriters     $ 2 $ (2)            
Sale of Common Stock to Underwriters, Shares       2,482,500 (2,482,500)            
Reclassification of common stock, Amount   $ (22)   $ 22            
Reclassification of Common Stock, Shares     22,707,813   (22,707,813)            
Conversion of Class B Common Stocks to Class A Common Stocks, Value     $ 70 $ (70)            
Conversion of Class B Common Stocks to Class A Common Stocks, Shares       70,310,049 (70,310,049)            
Other comprehensive income (loss) 25             25      
Net income (loss) (51,870)           (51,870)        
Balance at Sep. 30, 2021   $ 0                  
Balance, Shares at Sep. 30, 2021   0                  
Balance at Sep. 30, 2021 576,051   $ 0 $ 90 $ 65 794,777 (218,849) (32)      
Balance, Shares at Sep. 30, 2021     0 90,158,942 65,187,200            
Balance at Jun. 30, 2021 592,002     $ 40 $ 114 785,875 (194,046) 19      
Balance, Shares at Jun. 30, 2021       40,225,160 114,445,042            
Other offering costs in connection with initial public offering                 $ 24   $ 24
Issuance of common stock from the exercise of stock options 421     $ 1 $ 0 420          
Issuance of common stock from the exercise of stock options, Shares       554,283              
Stock-based compensation 9,787         9,787          
Issuance of common stock for vested restricted stock units (1,329)     $ 0   (1,329)          
Issuance of common stock for vested restricted stock units, Shares       121,657              
Conversion of Class B Common Stocks to Class A Common Stocks, Value     $ 49 $ (49)            
Conversion of Class B Common Stocks to Class A Common Stocks, Shares       49,257,842 (49,257,842)            
Other comprehensive income (loss) (51)             (51)      
Net income (loss) (24,803)           (24,803)        
Balance at Sep. 30, 2021   $ 0                  
Balance, Shares at Sep. 30, 2021   0                  
Balance at Sep. 30, 2021 $ 576,051   $ 0 $ 90 $ 65 $ 794,777 $ (218,849) $ (32)      
Balance, Shares at Sep. 30, 2021     0 90,158,942 65,187,200