Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Tables)

v3.8.0.1
Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Summary of Stock Options Activity

The activity for stock options under the Company’s stock plans is as follows:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Remaining

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

weighted-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Weighted-

 

 

average

 

 

Per share

 

 

 

 

 

 

 

 

 

 

average

 

 

contractual

 

 

average

 

 

 

 

 

 

Price per

 

 

exercise

 

 

terms

 

 

intrinsic

 

 

Options

 

 

share

 

 

price

 

 

(in years)

 

 

value

 

Outstanding as of December 31, 2014

 

2,261,633

 

 

$0.60-$24.52

 

 

$

7.31

 

 

 

6.43

 

 

$

24.06

 

Granted

 

759,301

 

 

37.10-46.66

 

 

 

39.91

 

 

 

 

 

 

 

 

 

Exercised

 

(676,715

)

 

0.60-24.52

 

 

 

2.39

 

 

 

 

 

 

 

 

 

Forfeited

 

(48,849

)

 

0.75-38.54

 

 

 

16.28

 

 

 

 

 

 

 

 

 

Outstanding as of December 31, 2015

 

2,295,370

 

 

0.60-46.66

 

 

 

19.36

 

 

 

5.98

 

 

 

21.07

 

Vested and exercisable as of December 31, 2015

 

933,707

 

 

0.60-46.66

 

 

 

7.16

 

 

 

5.55

 

 

 

32.97

 

Vested and expected to vest as of December 31, 2015

 

2,179,294

 

 

0.60-46.66

 

 

 

19.15

 

 

 

5.96

 

 

 

21.27

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Outstanding as of December 31, 2015

 

2,295,370

 

 

0.60-46.66

 

 

 

19.36

 

 

 

5.98

 

 

 

21.07

 

Granted

 

683,998

 

 

44.19-58.95

 

 

 

44.70

 

 

 

 

 

 

 

 

 

Exercised

 

(570,079

)

 

0.60-46.66

 

 

 

12.32

 

 

 

 

 

 

 

 

 

Forfeited

 

(53,247

)

 

1.17-44.19

 

 

 

28.09

 

 

 

 

 

 

 

 

 

Expired

 

(515

)

 

 

8.70

 

 

 

8.70

 

 

 

 

 

 

 

 

 

Outstanding as of December 31, 2016

 

2,355,527

 

 

0.60-58.95

 

 

 

28.22

 

 

 

5.42

 

 

 

38.95

 

Vested and exercisable as of December 31, 2016

 

1,023,865

 

 

0.60-46.66

 

 

 

16.61

 

 

 

4.96

 

 

 

50.56

 

Vested and expected to vest as of December 31, 2016

 

2,259,811

 

 

0.60-46.66

 

 

 

27.95

 

 

 

5.40

 

 

 

39.22

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Outstanding as of December 31, 2016

 

2,355,527

 

 

0.60-58.95

 

 

 

28.22

 

 

 

5.42

 

 

 

38.95

 

Granted

 

64,498

 

 

 

83.30

 

 

 

83.30

 

 

 

 

 

 

 

 

 

Exercised

 

(520,393

)

 

0.60-58.95

 

 

 

24.16

 

 

 

 

 

 

 

 

 

Forfeited

 

(63,173

)

 

24.52-58.95

 

 

 

43.74

 

 

 

 

 

 

 

 

 

Expired

 

(33

)

 

 

8.70

 

 

 

8.70

 

 

 

 

 

 

 

 

 

Outstanding as of December 31, 2017

 

1,836,426

 

 

0.60-83.30

 

 

 

30.77

 

 

 

4.58

 

 

 

88.31

 

Vested and exercisable as of December 31, 2017

 

1,176,504

 

 

0.60-83.30

 

 

 

24.33

 

 

 

4.39

 

 

 

94.75

 

Vested and expected to vest as of December 31, 2017

 

1,792,871

 

 

$0.60-$83.30

 

 

$

30.50

 

 

 

4.58

 

 

$

88.58

 

 

Summary of Restricted Stock Activity

Stock Awards activity for the year ended December 31, 2017 is summarized below:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Weighted-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

average

 

 

 

 

 

 

 

 

 

 

 

 

 

 

grant

 

 

 

 

 

 

Performance

 

 

 

 

 

 

date fair

 

 

 

 

 

 

and

 

 

 

 

 

 

value

 

 

Time-based

 

 

time-based

 

 

Total

 

 

per share

 

Unvested restricted stock units as of December 31, 2016

 

 

 

 

 

 

 

 

 

$

 

Granted

 

42,028

 

 

 

13,109

 

 

 

55,137

 

 

 

90.05

 

Vested

 

 

 

 

 

 

 

 

 

 

 

Forfeited/canceled

 

 

 

 

 

 

 

 

 

 

 

Unvested restricted stock units as of December 31, 2017

 

42,028

 

 

 

13,109

 

 

 

55,137

 

 

$

90.05

 

Unvested restricted stock awards outstanding as of December 31, 2016

 

 

 

 

 

 

 

 

 

$

 

Granted

 

20,789

 

 

 

20,785

 

 

 

41,574

 

 

 

91.52

 

Vested

 

 

 

 

 

 

 

 

 

 

 

Forfeited/canceled

 

 

 

 

 

 

 

 

 

 

 

Unvested restricted stock awards outstanding as of December 31, 2017

 

20,789

 

 

 

20,785

 

 

 

41,574

 

 

$

91.52

 

Unvested and expected to vest restricted stock awards outstanding as of December 31, 2017

 

17,024

 

 

 

17,027

 

 

 

34,051

 

 

$

91.52

 

 

Summary of Stock-based Compensation Expense

Stock-based compensation

Stock-based compensation expense recognized for the years ended December 31, 2017, 2016 and 2015 was as follows:

 

 

Years ended December 31,

 

(amounts in thousands)

2017

 

 

2016

 

 

2015

 

Stock-based compensation expense by type of award:

 

 

 

 

 

 

 

 

 

 

 

Stock option plan awards

$

7,652

 

 

$

6,850

 

 

$

3,280

 

Restricted stock units and restricted stock awards

 

1,447

 

 

 

 

 

 

 

Employee stock purchase plan

 

541

 

 

 

444

 

 

 

360

 

Total stock-based compensation expense

$

9,640

 

 

$

7,294

 

 

$

3,640

 

For the years ended December 31, 2017, 2016 and 2015, stock-based compensation expense recognized under ASC 718, included in cost of revenues, sales and marketing expense, general and administrative expense, and research and development expense was as follows:

 

 

Years ended December 31,

 

(amounts in thousands)

2017

 

 

2016

 

 

2015

 

Cost of revenue

$

845

 

 

$

639

 

 

$

433

 

Research and development

 

1,015

 

 

 

776

 

 

 

431

 

Sales and marketing

 

1,558

 

 

 

1,142

 

 

 

1,009

 

General and administrative

 

6,222

 

 

 

4,737

 

 

 

1,767

 

Total stock-based compensation expense

$

9,640

 

 

$

7,294

 

 

$

3,640

 

 

Assumptions Used to Estimate Fair Value of Employee Options

The value of employee options was estimated on the date of grant using the Black-Scholes option pricing model with the following assumptions used:

 

 

 

2017

 

2016

 

2015

Expected term (years)

 

3.54-4.00

 

3.54-5.48

 

3.50-5.48

Risk free interest rate

 

1.65-1.73%

 

1.00-1.40%

 

0.95-1.77%

Expected dividend yield

 

None

 

None

 

None

Volatility

 

41.61-42.15%

 

43.95-45.93%

 

41.99-44.87%