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Stock-Based Compensation
9 Months Ended
Sep. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Stock-Based Compensation

Note 7—Stock-Based Compensation

Stock-Based Compensation Expense

Stock-based compensation expense recorded in the condensed consolidated statements of operations was as follows (in thousands):

 

 

 

Three Months Ended

 

 

Nine Months Ended

 

 

 

September 30,

 

 

September 30,

 

 

 

2018

 

 

2017

 

 

2018

 

 

2017

 

Platform operations

 

$

1,234

 

 

$

818

 

 

$

3,137

 

 

$

1,543

 

Sales and marketing

 

 

3,033

 

 

 

1,500

 

 

 

7,757

 

 

 

3,277

 

Technology and development

 

 

4,013

 

 

 

1,990

 

 

 

8,905

 

 

 

3,981

 

General and administrative

 

 

3,137

 

 

 

1,585

 

 

 

8,159

 

 

 

3,605

 

Total

 

$

11,417

 

 

$

5,893

 

 

$

27,958

 

 

$

12,406

 

 

Stock Options

The following summarizes stock option activity:

 

 

 

Shares

Under Option

(in thousands)

 

 

Weighted-

Average

Exercise Price

 

Outstanding as of December 31, 2017

 

 

4,745

 

 

$

17.96

 

Granted

 

 

1,253

 

 

 

59.61

 

Exercised

 

 

(1,110

)

 

 

6.46

 

Cancelled

 

 

(59

)

 

 

44.31

 

Outstanding as of September 30, 2018

 

 

4,829

 

 

$

31.09

 

Exercisable as of September 30, 2018

 

 

2,016

 

 

$

12.36

 

 

On January 1, 2018, the number of shares authorized for grant under the Company’s 2016 Incentive Award Plan was increased by 1.7 million shares in accordance with plan provisions.

Restricted Stock and Restricted Stock Units (“Restricted Stock”)

The following summarizes Restricted Stock activity:

 

 

 

Shares

(in thousands)

 

 

Weighted-

Average

Grant Date

Fair Value

 

Unvested as of December 31, 2017

 

 

418

 

 

$

39.95

 

Granted

 

 

126

 

 

 

57.04

 

Vested

 

 

(43

)

 

 

40.92

 

Forfeited

 

 

 

 

 

 

Unvested as of September 30, 2018

 

 

501

 

 

$

44.17

 

 

Employee Stock Purchase Plan (“ESPP”)

Stock-based compensation expense related to the ESPP totaled $4.4 million and $3.2 million for the three months ended September 30, 2018 and 2017, respectively. Stock-based compensation expense related to the ESPP totaled $11.0 million and $6.1 million for the nine months ended September 30, 2018 and 2017, respectively.

On January 1, 2018, the number of shares available for issuance under the Company’s Employee Stock Purchase Plan was increased by 0.4 million shares in accordance with plan provisions.