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Stockholders Equity (Tables)
9 Months Ended
Sep. 30, 2023
Equity [Abstract]  
Schedule of Share-based Payment Arrangement, Option, Activity
The following table summarizes the option award activity for the nine months ended September 30, 2023 (in thousands, except share price, fair value and term):
Number of OptionsWeighted-
Average
Exercise
Price
Weighted-
Average
Remaining
Contractual
Term (in
years)
Aggregate
Intrinsic
Value (in
thousands)
TotalService
based
Performance-
based
Outstanding at December 31, 202222,820 15,504 7,316 $16.83 6.34$51,157 
Exercised(1,688)(1,165)(523)$11.63 
Forfeited or expired(1,348)(1,062)(286)$22.15 
Outstanding at September 30, 202319,784 13,277 6,507 $16.91 5.64$89,018 
Schedule of Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity
The following table summarizes RSU and PSU activity and related information during the nine months ended September 30, 2023 under the 2021 Plan (in thousands, except share price):
Number of Shares
Weighted-Average Grant Date Fair Value
Unvested and outstanding as of December 31, 2022
17,346 $22.95 
Granted
10,340 17.51 
Vested
(5,154)22.16 
Forfeited
(1,815)23.05 
Unvested and outstanding as of September 30, 2023
20,717 $20.40 
Schedule of Share-based Payment Arrangement, Expensed and Capitalized, Amount
The stock-based compensation for the periods indicated below are as follows (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2023202220232022
Cost of revenues
$8,764 $5,247 $25,074 $15,064 
Research and development
16,671 10,329 47,003 29,750 
Sales and marketing
16,317 10,500 45,854 28,072 
General and administrative
14,756 8,079 44,127 25,102 
Total stock-based compensation
$56,508 $34,155 $162,058 $97,988 
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions The following table summarizes the weighted-average assumptions used in estimating the fair value of the ESPP using the Black-Scholes pricing model:
Three Months Ended September 30,Nine Months Ended September 30,
2023202220232022
ESPP:
Expected term (in years)
      0.5 - 1.0
      0.5 - 1.0
      0.5 - 1.0
0.5 - 1.0
Expected volatility
36.2% - 39.4%
42.4% - 45.2%
36.2% - 48.5%
34.8% - 45.2%
Risk-free interest rate
5.4% - 5.5%
3.3% - 3.5%
5.1% - 5.5%
0.6% - 3.5%
Expected dividend yield
— %— %
—%
—%
Fair value of common stock
$21.14
$21.55
$17.06 - $21.14
$20.05 - $21.55