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Stock-based Compensation Plans and Awards (Tables)
 12 Months Ended
Dec. 31, 2017
Stock-based Compensation Plans and Awards  
Schedule of Stock-based Payment Award, Stock Options, Valuation Weighted Average Assumptions

 

 

 

 

 

 

 

 

 

 

Year ended December 31,

 

 

    

2017

    

2016

    

2015

 

Expected life (in years)

 

5.9

 

6.0

 

5.9

 

Risk-free interest rate

 

1.9

%  

1.3

%  

1.7

%  

Expected volatility range

 

53.0

%  

53.6

%  

53.4

%  

Expected dividend yield

 

—

 

—

 

—

 

 

Stock Options Activity

Stock option activity is as follows (in thousands, except per share data):

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Weighted

 

 

 

 

 

 

 

 

 

 

 

average

 

 

 

 

 

 

 

 

 

Weighted

 

remaining

 

 

 

 

 

 

Number of

 

 

average

 

contractual

 

Aggregate

 

 

    

options

 

 

exercise

 

term

 

intrinsic

 

 

 

outstanding

 

 

price

 

(in years)

 

value

 

Outstanding at December 31, 2016

 

2,856

 

$

8.31

 

7.88

 

$

1,489

 

Options granted

 

37

 

$

7.90

 

 

 

 

 

 

Options exercised

 

(413)

 

$

5.79

 

 

 

 

 

 

Options forfeited or cancelled

 

(340)

 

$

6.39

 

 

 

 

 

 

Outstanding at December 31, 2017

 

2,140

 

$

9.09

 

6.95

 

$

4,443

 

Exercisable at December 31, 2017

 

1,650

 

$

9.40

 

6.78

 

$

3,109

 

Vested and expected to vest at December 31, 2017

 

2,125

 

$

9.12

 

6.94

 

$

4,370

 

 

Schedule of Stock-Based Compensation, Activity

Information related to stock-based compensation activity is as follows (in thousands, except per share data):

 

 

 

 

 

 

 

 

 

 

 

 

 

Year ended December 31,

 

 

    

2017

    

2016

    

2015

 

Weighted average fair value of options granted (per option)

 

$

4.01

 

$

2.76

 

$

2.74

 

Intrinsic value of options exercised

 

$

893

 

$

97

 

$

13

 

 

Restricted Stock Unit Activity

Restricted Stock Units

 

 

 

 

 

 

 

 

 

 

 

Weighted

 

 

 

 

 

average

 

 

 

Number of

 

grant date

 

 

    

shares

 

fair value

 

Unvested at December 31, 2016

 

1,941

 

$

5.45

 

Granted

 

1,525

 

$

8.06

 

Vested

 

(1,036)

 

$

5.46

 

Forfeited

 

(542)

 

$

6.92

 

Unvested at December 31, 2017

 

1,888

 

$

7.13

 

 

Stock-based Compensation Expense

Stock-based compensation expense related to all employee and non-employee stock-based awards was as follows (in thousands):

 

 

 

 

 

 

 

 

 

 

 

 

 

Year ended December 31, 

 

 

    

2017

    

2016

    

2015

    

Service costs

 

$

599

 

$

1,174

 

$

1,084

 

Sales and marketing

 

 

759

 

 

725

 

 

691

 

Product development

 

 

1,847

 

 

1,502

 

 

2,192

 

General and administrative

 

 

5,360

 

 

4,378

 

 

3,595

 

Total stock-based compensation

 

$

8,565

 

$

7,779

 

$

7,562