Equity Compensation
12 Months Ended
Dec. 31, 2014
Equity Compensation  
Equity Compensation

 

6. 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 and restricted stock. 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 subsequent to 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 up to 5% of the outstanding number of shares of the Company’s Common Stock as of the preceding December 31. On January 1, 2015, the number of reserved shares was increased by 1,215,269 shares in accordance with the provisions of the 2013 Plan.

 

A summary of stock option activity for the years ended December 31, 2012, 2013 and 2014 is presented below:

 

 

 

Shares Subject
to Options
Outstanding

 

Weighted
Average
Grant Date
Fair Value

 

Weighted
Average
Exercise Price

 

Weighted
Average
Remaining
Contractual
Life (Years)

 

Balance at December 31, 2012

 

4,649,238

 

 

 

$

5.56

 

 

 

Granted

 

480,698

 

$

10.08

 

13.20

 

 

 

Exercised

 

(107,042

)

 

 

4.17

 

 

 

Expired

 

(27,772

)

 

 

5.79

 

 

 

Forfeited

 

(89,908

)

 

 

7.14

 

 

 

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

 

 

 

 

 

 

 

 

 

 

 

 

 

Exercisable options at December 31, 2013

 

3,285,695

 

 

 

4.88

 

4.9

 

Vested and expected to vest at December 31, 2013

 

4,544,942

 

 

 

6.15

 

5.9

 

Exercisable options at December 31, 2014

 

2,494,711

 

 

 

6.33

 

5.6

 

Vested and expected to vest at December 31, 2014

 

4,615,485

 

 

 

10.30

 

7.0

 

 

The following table summarizes information about stock options outstanding and exercisable at December 31, 2014:

 

 

 

Options Outstanding

 

Options Exercisable

 

Range of Exercise Prices

 

Weighted
Average
Exercise
Price

 

Number of
Underlying
Shares

 

Weighted-
Average
Remaining
Contractual
Life (in
years)

 

Number of
Underlying
Shares

 

Weighted-
Average
Remaining
Contractual
Life (in
years)

 

$0.78 - 1.72

 

$

1.10 

 

37,399 

 

0.8 

 

37,399 

 

0.8 

 

1.97 - 3.38

 

2.57 

 

248,746 

 

1.9 

 

248,746 

 

1.9 

 

3.58 - 6.14

 

5.64 

 

1,570,282 

 

5.7 

 

1,416,661 

 

5.6 

 

6.34 - 9.94

 

8.27 

 

1,007,227 

 

7.2 

 

627,128 

 

7.1 

 

11.28 - 16.97

 

13.94 

 

1,180,368 

 

9.0 

 

143,901 

 

6.3 

 

17.66 - 22.92

 

21.00 

 

807,199 

 

9.1 

 

20,876 

 

8.1 

 

 

 

 

 

4,851,221 

 

 

 

2,494,711 

 

 

 

 

For the stock option awards vested during the three and twelve months ended December 31, 2014, the total fair value was $0.8 million and $4.0 million, respectively. 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,

 

 

 

2012

 

2013

 

2014

 

Options Exercised

 

$

1,310 

 

$

1,315 

 

$

22,668 

 

Options Exercisable

 

16,800 

 

42,116 

 

22,718 

 

Options Vested and Expected to Vest

 

25,773 

 

55,099 

 

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,

 

 

 

2012

 

2013

 

2014

 

Expected volatility

 

59 - 63%

 

56 - 59%

 

49 - 60%

 

Expected dividends

 

0%

 

0%

 

0%

 

Expected terms (in years)

 

5.0 - 6.1

 

3.3 - 7.2

 

1.0 - 6.1

 

Risk-free rate

 

0.7 - 1.0%

 

0.8 - 1.7%

 

0.3 - 2.0%

 

 

Total stock-based compensation expense has been classified as follows in the accompanying statements of operations (in thousands):

 

 

 

Years Ended December 31,

 

 

 

2012

 

2013

 

2014

 

Cost of revenue

 

$

78 

 

$

63 

 

$

105 

 

Research and development

 

704 

 

1,414 

 

2,235 

 

Sales and marketing

 

580 

 

743 

 

1,110 

 

General and administrative

 

1,507 

 

1,540 

 

1,891 

 

Total stock-based compensation expense

 

$

2,869 

 

$

3,760 

 

$

5,341 

 

 

At December 31, 2014, there was $18.6 million of total unrecognized compensation cost related to non-vested stock option awards that will be recognized over a weighted-average period of 3.1 years.