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Stockholders' Equity and Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2018
Stockholders Equity And Stock Based Compensation [Abstract]  
Summary of Number of Shares of Common Stock Reserved The number of shares of common stock reserved for the vesting of RSUs and exercise of common stock options are as follows (in thousands):

 

 

 

December 31,

2018

 

 

December 31,

2017

 

RSUs

 

 

1,983

 

 

 

2,085

 

Common stock options

 

 

1,840

 

 

 

2,315

 

 

 

 

3,823

 

 

 

4,400

 

Schedule of Stock Compensation Expense by Award Type

The following two tables show stock compensation expense by award type and where the stock compensation expense is recorded in the Company’s consolidated statements of operations:

 

 

 

Year Ended December 31,

 

 

 

2018

 

 

2017

 

 

2016

 

 

 

( in thousands)

 

Options

 

$

5,108

 

 

$

4,948

 

 

$

5,202

 

ESPP

 

 

2,833

 

 

 

1,233

 

 

 

1,093

 

RSUs

 

 

68,320

 

 

 

41,136

 

 

 

26,380

 

Total stock-based compensation

 

$

76,261

 

 

$

47,317

 

 

$

32,675

 

Effect of Stock-Based Compensation on Income by Line Item

The following two tables show stock compensation expense by award type and where the stock compensation expense is recorded in the Company’s consolidated statements of operations:

 

 

 

2018

 

 

2017

 

 

2016

 

 

 

(in thousands)

 

Cost of revenue, subscription

 

$

1,476

 

 

$

658

 

 

$

512

 

Cost of revenue, service

 

 

2,924

 

 

 

2,327

 

 

 

1,640

 

Research and development

 

 

23,328

 

 

 

12,816

 

 

 

8,828

 

Sales and marketing

 

 

31,099

 

 

 

19,016

 

 

 

13,352

 

General and administrative

 

 

17,434

 

 

 

12,500

 

 

 

8,343

 

Total stock-based compensation

 

$

76,261

 

 

$

47,317

 

 

$

32,675

 

 

Schedule of Assumptions Used for Estimation of Fair Value of Options Granted to Employees

Stock Options —The fair value of employee options is estimated on the date of each grant using the Black-Scholes option-pricing model with the following assumptions:

 

 

 

Year Ended December 31,

 

 

 

2018

 

 

2017

 

 

2016

 

Risk-free interest rate (%)

 

2.62-2.85

 

 

1.74-2.09

 

 

1.38 - 1.41

 

Expected term (years)

 

5.06-6.42

 

 

5.18-6.21

 

 

5.08 - 6.21

 

Volatility (%)

 

41.34-43.55

 

 

39.4-43.7

 

 

38.0 - 41.0

 

Expected dividends

 

 

 

 

 

 

 

 

 

Summary of Stock Option Activity

The stock option activity for the year ended December 31, 2018 is as follows:

 

 

 

Options (in

thousands)

 

 

Weighted-

Average

Exercise

Price

 

 

Weighted-

Average

Remaining

Life (in years)

 

 

Aggregate

Intrinsic

Value

(in thousands)

 

Outstanding—January 1, 2018

 

 

2,315

 

 

$

16.69

 

 

 

5.3

 

 

$

165,974

 

Granted

 

146

 

 

 

113.95

 

 

 

 

 

 

 

 

 

Exercised

 

 

(608

)

 

17.87

 

 

 

 

 

 

 

 

 

Forfeited/expired

 

 

(13

)

 

32.01

 

 

 

 

 

 

 

 

 

Outstanding—December 31, 2018

 

 

1,840

 

 

 

23.89

 

 

 

4.6

 

 

$

187,342

 

Options vested or expected to vest—December 31, 2018

 

 

1,840

 

 

$

23.89

 

 

 

4.6

 

 

$

187,342

 

Options exercisable—December 31, 2018

 

 

1,576

 

 

$

14.38

 

 

3.9

 

 

$

175,466

 

Summary of Activity Related to RSUs

The following table summarizes the activity related to RSUs for the year ended December 31, 2018:

 

 

 

RSUs Outstanding

 

 

 

Shares (in

thousands)

 

 

Weighted-

Average

Grant Date

Fair Value

Per Share

 

Unvested and outstanding at January 1, 2018

 

 

2,085

 

 

$

54.12

 

Granted

 

 

1,162

 

 

 

110.43

 

Vested

 

 

(1,110

)

 

 

58.60

 

Canceled

 

 

(154

)

 

 

66.00

 

Unvested and outstanding at December 31, 2018

 

 

1,983

 

 

$

83.67

 

Summary of Activity Related to Employee Stock Purchase Plan

The following table summarizes the activity related to ESPP (in thousands, except the weighted average purchase price):

 

 

 

Shares Issued

(in thousands)

 

 

Weighted-

Average

Purchase Price

 

Total Cash

Proceeds

(in thousands)

 

2018

 

 

148

 

 

 

80.21

 

 

11,863

 

2017

 

 

94

 

 

 

38.83

 

 

3,635

 

2016

 

 

70

 

 

 

38.98

 

 

2,721