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COMMON STOCK (Tables)
 9 Months Ended
Sep. 30, 2023
Equity [Abstract]  
Schedule of common stock reserved for issuance
The Company has reserved shares of Class A common stock and Class B common stock for issuance for the following purposes (in thousands):
September 30,December 31,
20232022
Class A common stock
Options issued and outstanding under the 2013 Amended and Restated Stock Plan (the “2013 Plan”)902 982 
Options issued and outstanding under the 2019 Equity Incentive Plan (the “2019 Plan”)23,560 25,314 
RSUs issued and outstanding under the 2019 Plan1,100 2,418 
Options issued and outstanding under the 2021 Equity Incentive Plan (the “2021 Plan”)1,599 862 
RSUs issued and outstanding under the 2021 Plan4,413 2,911 
Performance Restricted Stock Units (the "PRSUs") issued and outstanding under the 2021 Plan804 — 
Shares available for future issuance under the 2021 Plan48,341 42,819 
Shares available for future issuance under the ESPP9,083 6,701 
RSUs and replacement options issued and outstanding from acquisitions140 135 
Shares available for future issuance of warrants2,296 2,296 
Total Class A common stock shares reserved92,238 84,438 
Class B common stock
Options issued and outstanding under the 2013 Plan3,823 4,502 
Total Class B common stock shares reserved3,823 4,502