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COMMON STOCK - Schedule of shares reserved for future issuance (Details) - shares shares in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Class A common stock |  |
Class of Stock [Line Items] |  |
Common stock reserved for future issuance (in shares) | 92,238 | 84,438
Options issued and outstanding under the 2013 Amended and Restated Stock Plan (the “2013 Plan”) |  |
Class of Stock [Line Items] |  |
Common stock reserved for future issuance (in shares) | 902 | 982
Options issued and outstanding under the 2019 Equity Incentive Plan (the “2019 Plan”) |  |
Class of Stock [Line Items] |  |
Common stock reserved for future issuance (in shares) | 23,560 | 25,314
RSUs issued and outstanding under the 2019 Plan |  |
Class of Stock [Line Items] |  |
Common stock reserved for future issuance (in shares) | 1,100 | 2,418
Options issued and outstanding under the 2021 Equity Incentive Plan (the “2021 Plan”) |  |
Class of Stock [Line Items] |  |
Common stock reserved for future issuance (in shares) | 1,599 | 862
RSUs issued and outstanding under the 2021 Plan |  |
Class of Stock [Line Items] |  |
Common stock reserved for future issuance (in shares) | 4,413 | 2,911
PRSUs Issued and Outstanding under 2021 Plan |  |
Class of Stock [Line Items] |  |
Common stock reserved for future issuance (in shares) | 804 | 0
Shares available for future issuance under the 2021 Plan |  |
Class of Stock [Line Items] |  |
Common stock reserved for future issuance (in shares) | 48,341 | 42,819
Shares available for future issuance under the ESPP |  |
Class of Stock [Line Items] |  |
Common stock reserved for future issuance (in shares) | 9,083 | 6,701
RSUs And Replacement Options Issued And Outstanding From Acquisition |  |
Class of Stock [Line Items] |  |
Common stock reserved for future issuance (in shares) | 140 | 135
Shares available for future issuance of warrants |  |
Class of Stock [Line Items] |  |
Common stock reserved for future issuance (in shares) | 2,296 | 2,296
Class B common stock |  |
Class of Stock [Line Items] |  |
Common stock reserved for future issuance (in shares) | 3,823 | 4,502
Options issued and outstanding under the 2013 Plan |  |
Class of Stock [Line Items] |  |
Common stock reserved for future issuance (in shares) | 3,823 | 4,502

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