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Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2021
Summary of Stock Option Award Activity

The following table summarizes the stock option award activity under the Stock Plans during the three months ended March 31, 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

 

 

 

 

 

 

 

$

 

 

 

 

 

$

 

Exercised

 

 

(314

)

 

 

(5

)

 

$

13.98

 

 

 

 

 

$

 

Forfeited

 

 

 

 

 

 

 

$

 

 

 

 

 

$

 

Outstanding at March 31, 2021

 

 

4,514

 

 

 

791

 

 

$

10.16

 

 

 

4.76

 

 

$

223,515

 

 

(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 March 31, 2021, respectively.

 

Summary of Total Stock-based Compensation Expense

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

 

 

Three Months Ended March 31,

 

 

2021

 

 

2020

 

 

(in thousands)

 

Cost of revenue

$

2,656

 

 

$

1,782

 

Research and development

 

163,793

 

 

 

118,317

 

Sales and marketing

 

29,084

 

 

 

24,806

 

General and administrative

 

41,540

 

 

 

27,144

 

Total

$

237,073

 

 

$

172,049

 

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 three months ended March 31, 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

 

 

3,252

 

 

$

60.94

 

Vested

 

 

(16,436

)

 

$

15.02

 

Forfeited

 

 

(3,681

)

 

$

12.04

 

Unvested at March 31, 2021

 

 

114,307

 

 

$

16.51