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Stock-based Compensation (Tables)
12 Months Ended
Dec. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Summary of Stock Option Activity

The following is a summary of the stock option activity for all stock‑based compensation plans during the year ended December 31, 2019:

 

 

Common

Stock

 

 

Weighted-

Average

Exercise Price

for Equity

 

 

Weighted-

Average

Remaining

Contractual Life

(In Years)

 

 

Aggregate

Intrinsic

Value(1)

 

Outstanding, December 31, 2018

 

 

1,807,515

 

 

$

2.35

 

 

5.9

 

 

$

56,716

 

Granted

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Exercised

 

 

(838,928

)

 

2.16

 

 

 

 

 

 

 

28,902

 

Forfeited and cancelled

 

 

(25,702

)

 

5.09

 

 

 

 

 

 

 

 

 

Outstanding, December 31, 2019

 

 

942,885

 

 

$

2.45

 

 

 

5.0

 

 

$

30,859

 

Options exercisable at December 31, 2019

 

 

913,197

 

 

$

2.31

 

 

 

5.0

 

 

$

30,016

 

 

(1)

The aggregate intrinsic value as of December 31, 2019 and 2018 was calculated based on the positive difference, if any, between the estimated fair value of our common stock on December 31, 2019 and 2018, respectively, or the date of exercise, as appropriate, and the exercise price of the underlying options.

Summary of Restricted Stock Unit Activity

The following is a summary of the RSU activity during the year ended December 31, 2019:

 

 

 

Number of

Shares

 

 

Weighted-

Average Grant

Date Fair Value

 

 

Aggregate

Intrinsic

Value

 

Unvested outstanding, December 31, 2018

 

 

2,973,002

 

 

$

26.06

 

 

$

100,279

 

Granted

 

 

1,811,208

 

 

 

39.07

 

 

 

 

 

Vested

 

 

(1,317,736

)

 

 

23.93

 

 

 

 

 

Forfeited

 

 

(383,173

)

 

 

31.70

 

 

 

 

 

Unvested outstanding, December 31, 2019

 

 

3,083,301

 

 

$

33.89

 

 

$

108,471

 

Summary of Stock-based Compensation Expense by Award Type

 

 

Year Ended December 31,

 

 

 

2019

 

 

2018

 

 

2017

 

Options

 

$

155

 

 

$

247

 

 

$

281

 

RSUs

 

 

34,146

 

 

 

20,547

 

 

 

4,747

 

Total stock-based compensation expense

 

$

34,301

 

 

$

20,794

 

 

$

5,028

 

 

Summary of Allocation of Stock-based Compensation Expense

 

 

Year Ended December 31,

 

 

 

2019

 

 

2018

 

 

2017

 

Cost of revenue

 

$

354

 

 

$

354

 

 

$

151

 

Sales and marketing expense

 

 

9,989

 

 

 

5,111

 

 

 

1,911

 

Product, technology, and development expense

 

 

15,159

 

 

 

9,865

 

 

 

1,637

 

General and administrative expense

 

 

8,799

 

 

 

5,464

 

 

 

1,329

 

Total stock-based compensation expense

 

$

34,301

 

 

$

20,794

 

 

$

5,028

 

 

Summary of Shares of Common Stock Reserved for Future Issuance

At December 31, 2019, the Company had reserved the following shares of voting common stock for future issuance:

 

Common stock options outstanding

 

 

942,885

 

Restricted stock units outstanding

 

 

3,083,301

 

Shares available for issuance under the 2017 Plan

 

 

5,889,929

 

Total shares of authorized common stock reserved for

   future issuance

 

 

9,916,115