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Stock-Based Compensation
9 Months Ended
Sep. 30, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Stock-Based Compensation

Note 8—Stock-Based Compensation

Stock-Based Compensation Expense

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

 

 

 

Three Months Ended

 

 

Nine Months Ended

 

 

 

September 30,

 

 

September 30,

 

 

 

2017

 

 

2016

 

 

2017

 

 

2016

 

Platform operations

 

$

818

 

 

$

75

 

 

$

1,543

 

 

$

114

 

Sales and marketing

 

 

1,500

 

 

 

200

 

 

 

3,277

 

 

 

318

 

Technology and development

 

 

1,990

 

 

 

216

 

 

 

3,981

 

 

 

330

 

General and administrative

 

 

1,585

 

 

 

165

 

 

 

3,605

 

 

 

286

 

Total

 

$

5,893

 

 

$

656

 

 

$

12,406

 

 

$

1,048

 

 

Stock Options

Stock option activity for the nine months ended September 30, 2017 was as follows:

 

 

 

Shares

Under Option

(in thousands)

 

 

Weighted-

Average

Exercise Price

 

Outstanding as of December 31, 2016 (1)

 

 

5,429

 

 

$

4.94

 

Granted

 

 

966

 

 

 

40.55

 

Exercised

 

 

(1,758

)

 

 

1.01

 

Cancelled

 

 

(192

)

 

 

17.17

 

Outstanding as of September 30, 2017 (2)

 

 

4,445

 

 

$

13.71

 

Exercisable as of September 30, 2017

 

 

2,163

 

 

$

3.63

 

 

 

(1)

Includes options to purchase 389 and 5,040 shares of Class A and Class B common stock, respectively.

 

(2)

Includes options to purchase 1,296 and 3,149 shares of Class A and Class B common stock, respectively.

On January 1, 2017, the number of shares authorized for grant under the Company’s 2016 Incentive Award Plan was increased by 1.6 million shares in accordance with plan provisions.

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

Restricted Stock activity for the nine months ended September 30, 2017 was as follows:

 

 

 

Shares

(in thousands)

 

 

Weighted-

Average

Grant Date

Fair Value

 

Unvested as of December 31, 2016

 

 

193

 

 

$

29.65

 

Granted

 

 

123

 

 

 

35.25

 

Vested

 

 

(1

)

 

 

22.90

 

Forfeited

 

 

(28

)

 

 

29.92

 

Unvested as of September 30, 2017

 

 

287

 

 

$

32.07

 

 

Employee Stock Purchase Plan

On January 1, 2017, 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. In May 2017, employees purchased 0.1 million shares for $2.3 million under this plan.