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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands | Total | 2023 Employee Bonus Plan | 2022 Employee Bonus Plan | Common Stock | Common Stock 2023 Employee Bonus Plan | Common Stock 2022 Employee Bonus Plan | Additional Paid-in Capital | Additional Paid-in Capital 2023 Employee Bonus Plan | Additional Paid-in Capital 2022 Employee Bonus Plan | Accumulated Deficit
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2022 |  |  |  |  | 33,393,737 |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2022 |  | $ 68,748 |  |  | $ 4 |  |  |  | $ 156,485 |  |  | $ (87,741)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  | (47,505) |  |  |  |  |  |  |  |  |  | (47,505)
Issuance of common stock upon exercise of stock options (in shares) |  |  |  |  | 1,844,602 |  |  |  |  |  |  |
Issuance of common stock upon exercise of stock options |  | 3,309 |  |  |  |  |  |  | 3,309 |  |  |
Issuance of Class A common stock under the 2021 Plan (in shares) |  |  |  |  | 1,589,837 |  |  |  |  |  |  |
Issuance of Class A common stock related to the Employee Stock Purchase Plan ("ESPP") (in shares) |  |  |  |  | 348,555 |  |  |  |  |  |  |
Issuance of Class A common stock related to the 2021 Employee Stock Purchase Plan ("ESPP") |  | 1,171 |  |  |  |  |  |  | 1,171 |  |  |
Issuance of restricted stock units related to the Bonus Plan (see Note 14) (in shares) |  |  |  |  |  |  |  | 287,908 |  |  |  |
Issuance of restricted stock units related to the Bonus Plan (see Note 14) |  |  |  | $ 1,848 |  |  |  |  |  |  | $ 1,848 |
Stock-based compensation |  | 19,787 |  |  |  |  |  |  | 19,787 |  |  |
Ending balance (in shares) at Sep. 30, 2023 |  |  |  |  | 37,464,639 |  |  |  |  |  |  |
Ending balance at Sep. 30, 2023 |  | 47,358 |  |  | $ 4 |  |  |  | 182,600 |  |  | (135,246)
Beginning balance (in shares) at Jun. 30, 2023 |  |  |  |  | 35,984,501 |  |  |  |  |  |  |
Beginning balance at Jun. 30, 2023 |  | 54,185 |  |  | $ 4 |  |  |  | 173,372 |  |  | (119,191)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  | (16,055) |  |  |  |  |  |  |  |  |  | (16,055)
Issuance of common stock upon exercise of stock options (in shares) |  |  |  |  | 659,837 |  |  |  |  |  |  |
Issuance of common stock upon exercise of stock options |  | 1,254 |  |  |  |  |  |  | 1,254 |  |  |
Issuance of Class A common stock under the 2021 Plan (in shares) |  |  |  |  | 820,301 |  |  |  |  |  |  |
Stock-based compensation |  | 7,974 |  |  |  |  |  |  | 7,974 |  |  |
Ending balance (in shares) at Sep. 30, 2023 |  |  |  |  | 37,464,639 |  |  |  |  |  |  |
Ending balance at Sep. 30, 2023 |  | 47,358 |  |  | $ 4 |  |  |  | 182,600 |  |  | (135,246)
Beginning balance (in shares) at Dec. 31, 2023 | [1] |  |  |  | 39,150,610 |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2023 |  | 44,938 |  |  | $ 4 | [1] |  |  | 192,388 |  |  | (147,454)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  | $ (34,154) |  |  |  |  |  |  |  |  |  | (34,154)
Issuance of common stock upon exercise of stock options (in shares) |  | 2,135,767 |  |  | 2,135,767 | [1] |  |  |  |  |  |
Issuance of common stock upon exercise of stock options |  | $ 6,336 |  |  |  |  |  |  | 6,336 |  |  |
Issuance of Class A common stock under the 2021 Plan (in shares) | [1] |  |  |  | 2,295,831 |  |  |  |  |  |  |
Issuance of Class A common stock related to the Employee Stock Purchase Plan ("ESPP") (in shares) | [1] |  |  |  | 386,517 |  |  |  |  |  |  |
Issuance of Class A common stock related to the 2021 Employee Stock Purchase Plan ("ESPP") |  | 1,359 |  |  |  |  |  |  | 1,359 |  |  |
Issuance of restricted stock units related to the Bonus Plan (see Note 14) (in shares) | [1] |  |  |  |  |  | 296,448 |  |  |  |  |
Issuance of restricted stock units related to the Bonus Plan (see Note 14) |  |  | $ 3,507 |  |  |  |  |  |  | $ 3,507 |  |
Stock-based compensation |  | 20,845 |  |  |  |  |  |  | 20,845 |  |  |
Ending balance (in shares) at Sep. 30, 2024 | [1] |  |  |  | 44,265,173 |  |  |  |  |  |  |
Ending balance at Sep. 30, 2024 |  | 42,831 |  |  | $ 4 | [1] |  |  | 224,435 |  |  | (181,608)
Beginning balance (in shares) at Jun. 30, 2024 | [1] |  |  |  | 42,886,281 |  |  |  |  |  |  |
Beginning balance at Jun. 30, 2024 |  | 45,098 |  |  | $ 4 | [1] |  |  | 213,949 |  |  | (168,855)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  | (12,753) |  |  |  |  |  |  |  |  |  | (12,753)
Issuance of common stock upon exercise of stock options (in shares) | [1] |  |  |  | 440,938 |  |  |  |  |  |  |
Issuance of common stock upon exercise of stock options |  | 1,337 |  |  |  |  |  |  | 1,337 |  |  |
Issuance of Class A common stock under the 2021 Plan (in shares) | [1] |  |  |  | 937,954 |  |  |  |  |  |  |
Stock-based compensation |  | 9,149 |  |  |  |  |  |  | 9,149 |  |  |
Ending balance (in shares) at Sep. 30, 2024 | [1] |  |  |  | 44,265,173 |  |  |  |  |  |  |
Ending balance at Sep. 30, 2024 |  | $ 42,831 |  |  | $ 4 | [1] |  |  | $ 224,435 |  |  | $ (181,608)
[1] | (1) On July 6, 2023, all shares of the Company’s then outstanding Class B common stock were automatically converted into the same number of Class A common stock, pursuant to the terms of the Company’s Amended and Restated Certificate of Incorporation. No additional shares of Class B common stock will be issued following such conversion. See Note 15 for further details.

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