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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 |  |  |

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- Definition Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(i)) -URI http://asc.fasb.org/extlink&oid=124359900&loc=SL124442526-122756 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(5)) -URI http://asc.fasb.org/extlink&oid=124359900&loc=SL124442526-122756 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(iv)) -URI http://asc.fasb.org/extlink&oid=124359900&loc=SL124442526-122756 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(5)) -URI http://asc.fasb.org/extlink&oid=124359900&loc=SL124442552-122756 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(i)) -URI http://asc.fasb.org/extlink&oid=124359900&loc=SL124442552-122756 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(iv)) -URI http://asc.fasb.org/extlink&oid=124359900&loc=SL124442552-122756 + Details
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