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Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2020
Summary of Stock Option Award Activity

The following table summarizes the stock option award activity under the Stock Plans during the six months ended June 30, 2020:

 

 

 

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, 2019

 

 

8,712

 

 

 

1,550

 

 

$

9.00

 

 

 

5.59

 

 

$

75,460

 

Granted

 

 

2

 

 

 

 

 

$

17.83

 

 

 

 

 

$

 

Exercised

 

 

(2,744

)

 

 

(393

)

 

$

7.52

 

 

 

 

 

$

 

Forfeited

 

 

(119

)

 

 

 

 

$

13.17

 

 

 

 

 

$

 

Outstanding at June 30, 2020

 

 

5,851

 

 

 

1,157

 

 

$

9.60

 

 

 

5.22

 

 

$

97,375

 

 

(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, 2019 and June 30, 2020, respectively.

 

Summary of Total Stock-based Compensation Expense

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

 

 

Three Months Ended June 30,

 

 

Six Months Ended June 30,

 

 

2020

 

 

2019

 

 

2020

 

 

2019

 

 

(in thousands)

 

Cost of revenue

$

2,066

 

 

$

1,786

 

 

$

3,848

 

 

$

3,635

 

Research and development

 

127,516

 

 

 

132,610

 

 

 

245,833

 

 

 

244,852

 

Sales and marketing

 

27,107

 

 

 

26,474

 

 

 

51,913

 

 

 

44,234

 

General and administrative

 

29,482

 

 

 

34,704

 

 

 

56,626

 

 

 

65,409

 

Total

$

186,171

 

 

$

195,574

 

 

$

358,220

 

 

$

358,130

 

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 six months ended June 30, 2020:

 

 

 

Class A

Outstanding

 

 

Weighted-

Average

Grant Date

Fair Value

 

 

 

(in thousands, except per share data)

 

Unvested at December 31, 2019

 

 

148,797

 

 

$

12.39

 

Granted

 

 

45,118

 

 

$

15.04

 

Vested

 

 

(36,051

)

 

$

13.46

 

Forfeited

 

 

(4,892

)

 

$

12.83

 

Unvested at June 30, 2020

 

 

152,972

 

 

$

12.91