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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 |  |  |  |  |  |

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