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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Schedule of Stock-Based Compensation Expense by Operating Expense Category

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

 

 

Summary of Stock Option Activity

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

 

 

Summary of Nonvested Restricted Stock Activity

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