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Stockholders' Equity (Tables)
9 Months Ended
Sep. 30, 2021
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, 2021:

 

 

 

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, 2020

 

 

4,828

 

 

 

796

 

 

$

10.37

 

 

 

5.20

 

 

$

223,230

 

Granted

 

 

48

 

 

 

 

 

$

49.63

 

 

 

 

 

$

 

Exercised

 

 

(891

)

 

 

(66

)

 

$

12.30

 

 

 

 

 

$

 

Forfeited

 

 

(7

)

 

 

 

 

$

13.53

 

 

 

 

 

$

 

Outstanding at September 30, 2021

 

 

3,978

 

 

 

730

 

 

$

10.38

 

 

 

4.41

 

 

$

298,934

 

 

(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, 2020 and September 30, 2021, 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,

 

 

2021

 

 

2020

 

 

2021

 

 

2020

 

 

(in thousands)

 

Cost of revenue

$

9,132

 

 

$

2,623

 

 

$

14,635

 

 

$

6,471

 

Research and development

 

198,893

 

 

 

132,003

 

 

 

537,177

 

 

 

377,836

 

Sales and marketing

 

51,675

 

 

 

27,393

 

 

 

118,250

 

 

 

79,306

 

General and administrative

 

41,198

 

 

 

30,061

 

 

 

124,509

 

 

 

86,687

 

Total

$

300,898

 

 

$

192,080

 

 

$

794,571

 

 

$

550,300

 

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, 2021:

 

 

 

Class A

Outstanding

 

 

Weighted-

Average

Grant Date

Fair Value

 

 

 

(in thousands, except per share data)

 

Unvested at December 31, 2020

 

 

131,172

 

 

$

15.10

 

Granted

 

 

18,168

 

 

$

59.13

 

Vested

 

 

(45,486

)

 

$

15.64

 

Forfeited

 

 

(7,980

)

 

$

15.04

 

Unvested at September 30, 2021

 

 

95,874

 

 

$

23.19