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Stockholders' Equity and Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2015
Stock-Based Compensation Resulting from Employee Incentive Share Arrangements

The following table presents stock-based compensation expense resulting from employee incentive stock arrangements and is presented in the following line items in the accompanying consolidated statements of income for the years ended December 31, 2015, 2014 and 2013 (in thousands):

 

Years Ended December 31,

 

2015

 

 

2014

 

 

2013

 

Operating expense

 

$

235

 

 

$

32

 

 

$

222

 

Sales and marketing

 

 

559

 

 

166

 

 

114

 

Research and development

 

 

104

 

 

16

 

 

345

 

General and administrative

 

 

2,112

 

 

498

 

 

253

 

Total stock-based compensation expense

 

$

3,010

 

 

$

712

 

 

$

934

 

 

Nonvested Restricted Stock Unit Awards

The following table presents a summary of the activity related to restricted stock for the year ended December 31, 2015: 

 

Year ended December 31, 2015

 

 

 

Number of

shares

 

 

Weighted

average grant-

date fair value

(in dollars)

 

Restricted stock outstanding at January 1, 2015

 

 

 

 

4,540,020

 

 

$

0.24

 

2015 Restricted Stock granted

 

 

 

 

741,931

 

 

 

27.65

 

2014 Restricted Stock vested

 

 

 

 

(3,287,091

)

 

 

0.20

 

2014 Restricted Stock forfeited

 

 

 

 

(7,215

)

 

 

0.48

 

2015 Restricted Stock forfeited

 

 

 

 

(7,805

)

 

 

30.95

 

Restricted stock outstanding at December 31, 2015

 

 

 

 

1,979,840

 

 

 

10.45

 

 

Incentive Units [Member]  
Summary of Grant-Date Fair Values and Related Assumptions

The following table presents a summary of the pre-conversion grant-date fair values of incentive units granted during 2013 and the related assumptions:

 

 

 

Year Ended December 31, 2013

 

Grant-date fair value

 

 

 

 

   Incentive units (converted to restricted stock as of January 1, 2014)

 

$0.11 - $0.92

 

Risk-free interest rates (based on 5 year U.S. Treasury Securities)

 

0.71% - 1.41%

 

Estimated volatility

 

 

50.0%

 

Expected life (in years)

 

 

5.0

 

Dividend yield

 

0%

 

 

2015 Restricted Stock [Member]  
Summary of Grant-Date Fair Values and Related Assumptions

The following table presents a summary of the grant-date fair values of 2015 Restricted Stock granted during the year ended December 31, 2015 and the related assumptions:

 

Years Ended December 31,

 

2015

 

Grant-date fair value

 

 

 

 

Restricted stock

 

$21.76 - $33.33

 

Risk-free interest rate (based on 10 year U.S. Treasury Securities)

 

 

2%

 

Estimated volatility

 

 

26.0%

 

Expected life (in years)

 

 

3.6

 

Dividend yield

 

0%