Equity Compensation
12 Months Ended
Dec. 31, 2016
Equity Compensation  
Equity Compensation

8. Equity Compensation

 

Stock Options

In 2003, the Board of Directors adopted the 2003 Equity Incentive Plan (the “2003 Plan”), which provided for the granting of nonqualified and incentive stock options, stock appreciation rights, stock awards, restricted stock units and restricted stock awards. Under the 2003 Plan, the Company was able to grant nonqualified and incentive stock options to directors, employees and non-employees providing services to the Company. On June 11, 2013, the Company’s Board of Directors adopted the 2013 Stock Option and Incentive Plan (the “2013 Plan”), which was subsequently approved by the Company’s stockholders. The 2013 Plan became effective as of the closing of the Company’s initial public offering. To the extent that any awards outstanding under the 2003 Plan are forfeited or lapse unexercised after August 1, 2013, the shares of common stock subject to such awards will become available for issuance under the 2013 Plan. The 2013 Plan provides for annual increases in the number of reserved shares of 5% of the outstanding number of shares of the Company’s Common Stock as of the preceding December 31. On January 1, 2017, the number of reserved shares was increased by 1,186,489 in accordance with the provisions of the 2013 Plan.

 

A summary of stock option activity for the years ended December 31, 2016, 2015 and 2014 is presented below:

 

 

 

 

 

 

 

 

 

 

 

 

 

    

 

    

 

 

    

 

 

    

Weighted

 

 

 

 

 

Weighted

 

 

 

 

Average

 

 

 

Shares Subject

 

Average

 

Weighted

 

Remaining

 

 

 

to Options

 

Grant Date

 

Average

 

Contractual

 

 

    

Outstanding

    

Fair Value

    

Exercise Price

    

Life (Years)

  

Balance at December 31, 2013

 

4,905,214

 

 

 

 

$

6.31

 

 

 

Granted

 

1,592,268

 

$

9.99

 

 

18.00

 

 

 

Exercised

 

(1,512,514)

 

 

 

 

 

4.24

 

 

 

Expired

 

(136)

 

 

 

 

 

7.40

 

 

 

Forfeited

 

(133,611)

 

 

 

 

 

13.77

 

 

 

Balance at December 31, 2014

 

4,851,221

 

 

 

 

 

10.57

 

 

 

Granted

 

238,516

 

 

5.31

 

 

10.52

 

 

 

Exercised

 

(285,387)

 

 

 

 

 

4.87

 

 

 

Expired

 

(47,866)

 

 

 

 

 

13.92

 

 

 

Forfeited

 

(183,812)

 

 

 

 

 

14.76

 

 

 

Balance at December 31, 2015

 

4,572,672

 

 

 

 

 

10.72

 

 

 

Granted

 

50,000

 

 

4.63

 

 

8.16

 

 

 

Exercised

 

(685,798)

 

 

 

 

 

5.01

 

 

 

Expired

 

(76,907)

 

 

 

 

 

14.96

 

 

 

Forfeited

 

(83,562)

 

 

 

 

 

14.81

 

 

 

Balance at December 31, 2016

 

3,776,405

 

 

 

 

 

11.55

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Exercisable options at December 31, 2015

 

3,185,180

 

 

 

 

 

8.76

 

5.2

 

Vested and expected to vest at December 31, 2015

 

4,466,655

 

 

 

 

 

10.61

 

6.1

 

Exercisable options at December 31, 2016

 

3,048,020

 

 

 

 

 

10.69

 

5.4

 

Vested and expected to vest at December 31, 2016

 

3,733,643

 

 

 

 

 

11.52

 

5.8

 

 

The following table summarizes information about stock options outstanding and exercisable at December 31, 2016:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Options Outstanding

 

Options Exercisable

 

 

 

 

 

    

 

 

    

 

    

Weighted-

    

 

    

Weighted-

 

 

 

 

 

 

Weighted

 

 

 

Average

 

 

 

Average

 

 

 

 

 

 

Average

 

Number of

 

Remaining

 

Number of

 

Remaining

 

 

 

 

 

 

Exercise

 

Underlying

 

Contractual

 

Underlying

 

Contractual

 

Range of Exercise Prices

    

Price

    

Shares

    

Life (in years)

    

Shares

    

Life (in years)

  

$

2.65

-

4.78

 

 

3.47

 

48,270

 

0.7

 

48,270

 

0.7

 

$

4.89

-

7.49

 

 

6.04

 

1,292,766

 

4.3

 

1,276,908

 

4.3

 

$

8.16

-

12.93

 

 

10.36

 

1,133,575

 

6.0

 

898,013

 

5.5

 

$

12.98

-

19.56

 

 

15.65

 

654,517

 

7.8

 

360,315

 

7.6

 

$

20.91

-

22.92

 

 

21.07

 

647,277

 

7.0

 

464,514

 

6.9

 

 

 

 

 

 

 

 

 

3,776,405

 

 

 

3,048,020

 

 

 

 

The total fair value of stock option awards vested during the year ended December 31, 2016 was $5.4 million. The following table summarizes the aggregate intrinsic‑value of options exercised, outstanding and exercisable (in thousands):

 

 

 

 

 

 

 

 

 

 

 

 

 

For the Years Ended

 

 

 

and as of December 31,

 

 

 

2016

    

2015

    

2014

 

Options Exercised

 

$

3,312

 

$

1,432

 

$

22,668

 

Options Exercisable

 

 

6,089

 

 

3,496

 

 

22,718

 

Options Vested and Expected to Vest

 

 

6,280

 

 

3,499

 

 

27,663

 

 

The fair value of each option award is estimated on the date of grant using the Black‑Scholes option‑pricing model with the following assumptions:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Years Ended

 

 

December 31,

 

 

2016

 

 

2015

    

 

2014

 

Expected volatility

 

 

62

%  

 

 

51

-

55

%  

 

49

-

60

%  

Expected dividends

 

 

0

%  

 

 

0

%  

 

0

%  

Expected terms (in years)

 

 

6.1

 

 

 

5.3

-

6.1

 

 

1.0

-

6.1

 

Risk-free rate

 

 

1.1

%  

 

 

1.3

-

1.8

%  

 

0.3

-

2.0

%  

 

Restricted stock units

 

A summary of restricted stock unit activity for the year ended December 31, 2016 is presented below:

 

 

 

 

 

 

 

 

 

Number of

 

Weighted Average

 

 

    

Shares

    

Grant Date Fair Value

 

Non-vested balance at December 31, 2014

 

 —

 

 

 

 

Awarded

 

433,000

 

$

8.18

 

Forfeited

 

(8,000)

 

 

8.18

 

Non-vested balance at December 31, 2015

 

425,000

 

 

8.18

 

Awarded

 

1,147,946

 

 

7.40

 

Vested

 

(35,340)

 

 

7.85

 

Forfeited

 

(141,219)

 

 

7.66

 

Non-vested balance at December 31, 2016

 

1,396,387

 

 

7.60

 

 

The aggregate intrinsic value of unvested restricted stock at December 31, 2016 was $14.2 million.  The aggregate intrinsic value represents the total pretax intrinsic value, based on the Company’s stock price of $10.20 as of December 31, 2016, which would have been received by the restricted stock unit participants had all restricted stock units been vested as of that date.  

 

Stock-based compensation expense

 

Total stock‑based compensation expense has been classified as follows in the accompanying Consolidated Statements of Operations (in thousands):

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Years Ended

 

 

 

 

December 31,

 

 

    

 

2016

    

2015

    

2014

 

Cost of revenue

 

 

$

171

 

$

174

 

$

105

 

Research and development

 

 

 

3,256

 

 

2,885

 

 

2,235

 

Sales and marketing

 

 

 

2,273

 

 

1,783

 

 

1,110

 

General and administrative

 

 

 

2,670

 

 

2,192

 

 

1,891

 

Total stock-based compensation expense

 

 

$

8,370

 

$

7,034

 

$

5,341

 

 

At December 31, 2016, there was $6.3 million of total unrecognized compensation cost related to non‑vested stock option awards that will be recognized over a weighted‑average period of 1.7 years.  At December 31, 2016, there was $7.3 million of total unrecognized compensation cost related to non-vested restricted stock units that will be recognized over a weighted-average period of 2.2 years.