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UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Accounts receivable allowance | $ 699 | $ 1,387 | $ 1,122
Treasury stock, shares |  | 248,227 | 248,227
Series A, convertible preferred stock |  |  |
Convertible preferred stock, par value | $ 0.001 | $ 0.001 | $ 0.001
Convertible preferred stock, shares authorized | 3,500,000 | 3,500,000 | 3,500,000
Convertible preferred stock, shares issued | 3,500,000 | 3,500,000 | 3,500,000
Temporary equity, shares outstanding | 3,500,000 | 3,500,000 | 3,500,000
Series A1, convertible preferred stock |  |  |
Convertible preferred stock, par value | $ 0.001 | $ 0.001 | $ 0.001
Convertible preferred stock, shares authorized | 3,800,515 | 3,800,515 | 3,800,515
Convertible preferred stock, shares issued | 3,800,515 | 3,800,515 | 3,800,515
Temporary equity, shares outstanding | 3,800,515 | 3,800,515 | 3,800,515
Series B, convertible preferred stock |  |  |
Convertible preferred stock, par value | $ 0.001 | $ 0.001 | $ 0.001
Convertible preferred stock, shares authorized | 4,401,242 | 4,401,242 | 4,401,242
Convertible preferred stock, shares issued | 4,401,242 | 4,401,242 | 4,401,242
Temporary equity, shares outstanding | 4,401,242 | 4,401,242 | 4,401,242
Series C, convertible preferred stock |  |  |
Convertible preferred stock, par value | $ 0.001 | $ 0.001 | $ 0.001
Convertible preferred stock, shares authorized | 5,024,637 | 5,024,637 | 5,024,637
Convertible preferred stock, shares issued | 5,024,637 | 5,024,637 | 5,024,637
Temporary equity, shares outstanding | 5,024,637 | 5,024,637 | 5,024,637
Series D, convertible preferred stock |  |  |
Convertible preferred stock, par value | $ 0.001 | $ 0.001 | $ 0.001
Convertible preferred stock, shares authorized | 2,412,718 | 2,412,718 | 2,412,718
Convertible preferred stock, shares issued | 2,412,718 | 2,412,718 | 2,412,718
Temporary equity, shares outstanding | 2,412,718 | 2,412,718 | 2,412,718
Series E, convertible preferred stock |  |  |
Convertible preferred stock, par value | $ 0.001 | $ 0.001 | $ 0.001
Convertible preferred stock, shares authorized | 1,605,982 | 1,605,982 | 1,605,982
Convertible preferred stock, shares issued | 1,605,982 | 1,605,982 | 1,605,982
Temporary equity, shares outstanding | 1,605,982 | 1,605,982 | 1,605,982
Series F, convertible preferred stock |  |  |
Convertible preferred stock, par value | $ 0.001 | $ 0.001 | $ 0.001
Convertible preferred stock, shares authorized | 4,440,498 | 4,440,498 | 4,440,498
Convertible preferred stock, shares issued | 4,440,498 | 4,440,498 | 4,440,498
Temporary equity, shares outstanding | 4,440,498 | 4,440,498 | 4,440,498
Series G, convertible preferred stock |  |  |
Convertible preferred stock, par value | $ 0.001 | $ 0.001 | $ 0.001
Convertible preferred stock, shares authorized | 4,440,498 | 4,440,498 | 4,440,498
Convertible preferred stock, shares issued | 4,440,498 | 4,440,498 | 4,440,498
Temporary equity, shares outstanding | 4,440,498 | 4,440,498 | 4,440,498
Class A Common Stock |  |  |
Common stock, par value | $ 0.0001 | $ 0.0001 | $ 0.0001
Common shares, shares authorized | 500,000,000 | 500,000,000 | 500,000,000
Common shares, shares issued | 12,803,162 | 5,034,459 | 5,014,300
Common shares, shares outstanding | 5,081,771 | 5,034,459 | 5,014,300
Class B Common Stock |  |  |
Common stock, par value | $ 0.0001 | $ 0.0001 | $ 0.0001
Common shares, shares authorized | 500,000,000 | 500,000,000 | 500,000,000
Common shares, shares issued | 27,391,338 | 34,362,554 | 34,152,328
Common shares, shares outstanding | 27,143,111 | 34,114,327 | 33,904,101
Treasury stock, shares | 248,227 | 248,227 |
Class C Common stock |  |  |
Common stock, par value | $ 0.0001 | $ 0.0001 | $ 0.0001
Common shares, shares authorized | 25,000,000 | 25,000,000 | 25,000,000
Common shares, shares issued | 21,170,037 | 0 | 0
Common shares, shares outstanding | 21,170,037 | 0 | 0

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