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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' (DEFICIT) - USD ($)
$ in Thousands
Common Stock [Member]
Class A Common Stock [Member]
Common Stock [Member]
Class B Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Total
Balance at Dec. 31, 2019         $ 160,555
Balance (in shares) at Dec. 31, 2019         84,201,570
Increase (Decrease) in Temporary Equity [Roll Forward]          
Issuance of Series E convertible preferred stock, net of issuance costs         $ 10,288
Issuance of Series E convertible preferred stock, net of issuance costs (in shares)         1,923,519
Balance at Mar. 31, 2020         $ 170,843
Balance (in shares) at Mar. 31, 2020         86,125,089
Balance at Dec. 31, 2019 $ 1 $ 0 $ 10,530 $ (135,630) $ (125,099)
Balance (in shares) at Dec. 31, 2019 5,263,403 0      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss $ 0 $ 0 0 (10,314) (10,314)
Issuance of series E convertible preferred stock, net of issuance costs $ 0 $ 0 0 0 0
Issuance of series E convertible preferred stock, net of issuance costs (in shares) 0 0      
Common stock issued upon exercise of stock options $ 0 $ 0 18 0 18
Common stock issued upon exercise of stock options (in shares) 87,796 0      
Stock-based compensation expense $ 0 $ 0 642 0 642
Balance at Mar. 31, 2020 $ 1 $ 0 11,190 (145,944) (134,753)
Balance (in shares) at Mar. 31, 2020 5,351,199 0      
Balance at Dec. 31, 2019         $ 160,555
Balance (in shares) at Dec. 31, 2019         84,201,570
Balance at Sep. 30, 2020         $ 170,831
Balance (in shares) at Sep. 30, 2020         86,125,089
Balance at Dec. 31, 2019 $ 1 $ 0 10,530 (135,630) $ (125,099)
Balance (in shares) at Dec. 31, 2019 5,263,403 0      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss         (27,068)
Balance at Sep. 30, 2020 $ 1 $ 0 12,173 (162,698) (150,524)
Balance (in shares) at Sep. 30, 2020 5,366,827 0      
Balance at Mar. 31, 2020         $ 170,843
Balance (in shares) at Mar. 31, 2020         86,125,089
Increase (Decrease) in Temporary Equity [Roll Forward]          
Issuance of Series E convertible preferred stock, net of issuance costs         $ (12)
Issuance of Series E convertible preferred stock, net of issuance costs (in shares)         0
Balance at Jun. 30, 2020         $ 170,831
Balance (in shares) at Jun. 30, 2020         86,125,089
Balance at Mar. 31, 2020 $ 1 $ 0 11,190 (145,944) $ (134,753)
Balance (in shares) at Mar. 31, 2020 5,351,199 0      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss $ 0 $ 0 0 (8,197) (8,197)
Issuance of series E convertible preferred stock, net of issuance costs $ 0 $ 0 0 0 0
Issuance of series E convertible preferred stock, net of issuance costs (in shares) 0 0      
Stock-based compensation expense $ 0 $ 0 466 0 466
Balance at Jun. 30, 2020 $ 1 $ 0 11,656 (154,141) (142,484)
Balance (in shares) at Jun. 30, 2020 5,351,199 0      
Balance at Sep. 30, 2020         $ 170,831
Balance (in shares) at Sep. 30, 2020         86,125,089
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss $ 0 $ 0 0 (8,557) $ (8,557)
Common stock issued upon exercise of stock options $ 0 $ 0 24 0 24
Common stock issued upon exercise of stock options (in shares) 15,628 0      
Stock-based compensation expense $ 0 $ 0 493 0 493
Balance at Sep. 30, 2020 $ 1 $ 0 12,173 (162,698) (150,524)
Balance (in shares) at Sep. 30, 2020 5,366,827 0      
Balance at Dec. 31, 2020         $ 195,814
Balance (in shares) at Dec. 31, 2020         90,789,268
Increase (Decrease) in Temporary Equity [Roll Forward]          
Issuance of Series E convertible preferred stock, net of issuance costs         $ (4)
Issuance of Series E convertible preferred stock, net of issuance costs (in shares)         0
Balance at Mar. 31, 2021         $ 195,810
Balance (in shares) at Mar. 31, 2021         90,789,268
Balance at Dec. 31, 2020 $ 1 $ 0 12,517 (172,243) $ (159,725)
Balance (in shares) at Dec. 31, 2020 5,378,287 0      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss $ 0 $ 0 0 (11,779) (11,779)
Issuance of series E convertible preferred stock, net of issuance costs $ 0 $ 0 0 0 0
Issuance of series E convertible preferred stock, net of issuance costs (in shares) 0 0      
Common stock issued upon exercise of stock options $ 0 $ 0 999 0 999
Common stock issued upon exercise of stock options (in shares) 581,237 0      
Stock-based compensation expense $ 0 $ 0 457 0 457
Balance at Mar. 31, 2021 $ 1 $ 0 13,973 (184,022) (170,048)
Balance (in shares) at Mar. 31, 2021 5,959,524 0      
Balance at Dec. 31, 2020         $ 195,814
Balance (in shares) at Dec. 31, 2020         90,789,268
Balance at Sep. 30, 2021         $ 0
Balance (in shares) at Sep. 30, 2021         0
Balance at Dec. 31, 2020 $ 1 $ 0 12,517 (172,243) $ (159,725)
Balance (in shares) at Dec. 31, 2020 5,378,287 0      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss         (65,567)
Balance at Sep. 30, 2021 $ 12 $ 2 731,711 (237,810) 493,915
Balance (in shares) at Sep. 30, 2021 116,717,990 19,937,500      
Balance at Mar. 31, 2021         $ 195,810
Balance (in shares) at Mar. 31, 2021         90,789,268
Increase (Decrease) in Temporary Equity [Roll Forward]          
Conversion of the convertible preferred stock into Class A and B common stock         $ (195,810)
Conversion of the convertible preferred stock into Class A and B common stock (in shares)         (90,789,268)
Balance at Jun. 30, 2021         $ 0
Balance (in shares) at Jun. 30, 2021         0
Balance at Mar. 31, 2021 $ 1 $ 0 13,973 (184,022) $ (170,048)
Balance (in shares) at Mar. 31, 2021 5,959,524 0      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss $ 0 $ 0 0 (35,697) (35,697)
Common stock issued upon exercise of stock options $ 0 $ 0 2,712 0 2,712
Common stock issued upon exercise of stock options (in shares) 1,327,823 0      
Conversion of the convertible preferred stock into common stock $ 5 $ 2 195,803 0 195,810
Conversion of the convertible preferred stock into common stock (in shares) 52,466,941 19,937,500      
Net equity infusion from the Business Combination $ 6 $ 0 501,166 0 501,172
Net equity infusion from the Business Combination (in shares) 56,708,872 0      
Stock-based compensation expense $ 0 $ 0 9,987 0 9,987
Balance at Jun. 30, 2021 $ 12 $ 2 723,641 (219,719) 503,936
Balance (in shares) at Jun. 30, 2021 116,463,160 19,937,500      
Balance at Sep. 30, 2021         $ 0
Balance (in shares) at Sep. 30, 2021         0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss $ 0 $ 0 0 (18,091) $ (18,091)
Common stock issued upon exercise of stock options $ 0 $ 0 676 0 676
Common stock issued upon exercise of stock options (in shares) 254,830 0      
Net equity infusion from the Business Combination $ 0 $ 0 (2) 0 (2)
Net equity infusion from the Business Combination (in shares) 0 0      
Stock-based compensation expense $ 0 $ 0 7,396 0 7,396
Balance at Sep. 30, 2021 $ 12 $ 2 $ 731,711 $ (237,810) $ 493,915
Balance (in shares) at Sep. 30, 2021 116,717,990 19,937,500