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Stock-based compensation (Tables)
9 Months Ended
Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]  
Stock option activity
The following table summarizes the Company’s stock option activity during the periods presented (in thousands except share and per share data):
Number of options outstandingWeighted  average  exercise  price  ($)Weighted average remaining contractual term (years)Aggregate intrinsic value ($)
Balance as of December 31, 202215,387,546$1.76 7.12$8,763 
Granted— — — 
Exercised(2,329,067)0.81 — 144 
Forfeited(1,019,743)3.57 — — 
Expired(388,956)2.36 — — 
Balance as of September 30, 202311,649,780$1.66 7.32$1,618 
Options exercisable as of September 30, 20239,809,565$1.24 7.13$1,438 
Options unvested as of September 30, 20231,840,072$3.89 8.35$180 
RSU activity
The following table summarizes the RSU activity and related information under the 2022 Plan:
Number of OutstandingWeighted average Grant Date Fair Value ($)
Unvested as of December 31, 20228,143,304 $5.69 
Granted4,423,933 0.89 
Forfeited(1,446,883)4.63 
Vested(167,605)4.02 
Unvested as of September 30, 202310,952,749 $3.93 
Expected to vest as of September 30, 202310,436,290 $3.97 
Stock-based compensation expense
The following table summarizes the stock-based compensation expense classified in the condensed consolidated statements of operations and comprehensive loss as follows (in thousands):

Three months ended September 30,
20232022
Cost of revenue$353 $45 
Research and development2,347 360 
General and administrative2,913 644 
Sales and marketing271 732 
Total stock-based compensation$5,884 $1,781 
Nine months ended September 30,
20232022
Cost of revenue$963 $80 
Research and development6,771 536 
General and administrative8,849 1,948 
Sales and marketing779 791 
Total stock-based compensation$17,362 $3,355