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Stockholders' Equity (Tables)
9 Months Ended
Sep. 30, 2022
Summary of Stock Option Award Activity

The following table summarizes the stock option award activity under the Stock Plans during the nine months ended September 30, 2022:

 

 

 

Class A

Number

of Shares

 

 

Class B

Number

of Shares

 

 

Weighted-

Average

Exercise

Price

 

 

Weighted-

Average

Remaining

Contractual

Term

(in years)

 

 

Aggregate

Intrinsic

Value (1)

 

 

 

(in thousands, except per share data)

 

Outstanding at December 31, 2021

 

 

3,676

 

 

 

628

 

 

$

10.59

 

 

 

4.19

 

 

$

157,374

 

Granted

 

 

119

 

 

 

 

 

$

15.03

 

 

 

 

 

$

 

Exercised

 

 

(286

)

 

 

(10

)

 

$

13.13

 

 

 

 

 

$

 

Forfeited

 

 

(43

)

 

 

 

 

$

12.82

 

 

 

 

 

$

 

Outstanding at September 30, 2022

 

 

3,466

 

 

 

618

 

 

$

10.51

 

 

 

3.38

 

 

$

11,250

 

 

(1)

The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying stock option awards and the closing market price of our Class A common stock as of December 31, 2021 and September 30, 2022, respectively.

 

Summary of Total Stock-based Compensation Expense

Total stock-based compensation expense by function was as follows:

 

 

Three Months Ended September 30,

 

 

Nine Months Ended September 30,

 

 

2022

 

 

2021

 

 

2022

 

 

2021

 

 

(in thousands)

 

Cost of revenue

$

2,745

 

 

$

9,132

 

 

$

8,040

 

 

$

14,635

 

Research and development

 

246,783

 

 

 

198,893

 

 

 

651,299

 

 

 

537,177

 

Sales and marketing

 

43,098

 

 

 

51,675

 

 

 

133,746

 

 

 

118,250

 

General and administrative

 

50,333

 

 

 

41,198

 

 

 

144,128

 

 

 

124,509

 

Total

$

342,959

 

 

$

300,898

 

 

$

937,213

 

 

$

794,571

 

Restricted Stock Units and Restricted Stock Awards  
Summary of RSU and RSA Activity

Restricted Stock Units and Restricted Stock Awards

The following table summarizes the RSU and RSA activity during the nine months ended September 30, 2022:

 

 

 

Class A

Outstanding

 

 

Weighted-

Average

Grant Date

Fair Value

 

 

 

(in thousands, except per share data)

 

Unvested at December 31, 2021

 

 

86,180

 

 

$

26.07

 

Granted

 

 

67,165

 

 

$

18.88

 

Vested

 

 

(40,756

)

 

$

20.81

 

Forfeited

 

 

(18,446

)

 

$

26.00

 

Unvested at September 30, 2022

 

 

94,143

 

 

$

23.23