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Stock Options, Stock Purchase Plan and Warrants (Tables)
12 Months Ended
Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Fair Value of Each Stock Option Award Granted

The fair value of each stock option award granted during the years ended December 31, 2017, 2016 and 2015 was estimated as of the grant date using a trinomial lattice model with the following weighted average assumptions:

 

 

 

2017

 

 

2016

 

 

2015

 

Expected term (in years)

 

3.0 – 4.5

 

 

1.0 – 4.5

 

 

2.5 – 4.6

 

Risk-free interest rate (%)

 

 

1.5

%

 

 

1.1

%

 

 

1.2

%

Expected volatility (%)

 

 

49

%

 

 

54

%

 

 

51

%

Dividend yield (%)

 

 

0.0

%

 

 

0.0

%

 

 

0.0

%

Weighted average fair value/share at grant date

 

$

2.26

 

 

$

2.23

 

 

$

1.84

 

 

Status of Our Stock Options

The status of our stock options are summarized as follows: 

 

 

 

Number

Of

Shares

 

 

Weighted

Average

Exercise

Price

 

Outstanding at December 31, 2014

 

 

4,012,096

 

 

$

2.04

 

 

 

 

 

 

 

 

 

 

Granted

 

 

1,819,000

 

 

 

4.90

 

Exercised

 

 

(492,091

)

 

 

1.45

 

Canceled

 

 

(12,500

)

 

 

3.19

 

Outstanding at December 31, 2015

 

 

5,326,505

 

 

 

3.07

 

 

 

 

 

 

 

 

 

 

Granted

 

 

2,617,526

 

 

 

7.14

 

Exercised

 

 

(2,483,519

)

 

 

1.69

 

Canceled

 

 

(324,402

)

 

 

3.99

 

Outstanding at December 31, 2016

 

 

5,136,110

 

 

 

5.76

 

 

 

 

 

 

 

 

 

 

Granted

 

 

2,119,498

 

 

 

7.60

 

Exercised

 

 

(565,569

)

 

 

3.84

 

Canceled

 

 

(347,513

)

 

 

6.12

 

Outstanding at December 31, 2017

 

 

6,342,526

 

 

 

6.51

 

Exercisable at December 31, 2017

 

 

2,103,342

 

 

 

5.50

 

 

Roll Forward of Non-Vested Stock Options Activity

The number and weighted average grant-date fair values of options non-vested at the beginning and end of 2017, as well as options granted, vested and forfeited during the year was as follows:

 

 

 

Number of

Options

 

 

Weighted

Average

Grant Date

Fair Value

 

Non-vested at December 31, 2016

 

 

4,008,478

 

 

$

2.09

 

Granted in 2017

 

 

2,119,498

 

 

 

2.26

 

Vested in 2017

 

 

(1,584,554

)

 

 

2.20

 

Forfeited in 2017

 

 

(304,237

)

 

 

2.38

 

Non-vested at December 31, 2017

 

 

4,239,185

 

 

 

2.29

 

 

Summary of Information about our Options Outstanding

 

The following table summarizes information about our options outstanding at December 31, 2017:

 

 

 

Options Outstanding

 

 

Options Exercisable

 

Range of

Exercise

Prices ($)

 

Number

Outstanding

 

 

Weighted

Average

Remaining

Contractual

Life (Years)

 

 

Weighted

Average

Exercise

Price

 

 

Number

Exercisable

 

 

Weighted

Average

Remaining

Contractual

Life (Years)

 

 

Weighted

Average

Exercise

Price

 

1.47 – 4.00

 

 

296,001

 

 

 

0.97

 

 

$

3.53

 

 

 

273,501

 

 

 

0.95

 

 

$

3.52

 

4.01 – 5.00

 

 

1,600,334

 

 

 

2.23

 

 

 

4.76

 

 

 

1,044,500

 

 

 

2.20

 

 

 

4.75

 

5.01 – 7.00

 

 

513,832

 

 

 

2.97

 

 

 

6.59

 

 

 

158,257

 

 

 

2.87

 

 

 

6.49

 

7.01 – 7.50

 

 

1,901,528

 

 

 

3.49

 

 

 

7.17

 

 

 

507,511

 

 

 

3.30

 

 

 

7.15

 

7.51 – 8.00

 

 

1,644,999

 

 

 

4.26

 

 

 

7.55

 

 

 

37,500

 

 

 

2.98

 

 

 

7.86

 

8.01 – 9.47

 

 

385,832

 

 

 

3.93

 

 

 

8.47

 

 

 

82,073

 

 

 

3.65

 

 

 

8.39

 

 

 

 

6,342,526

 

 

 

3.24

 

 

 

6.52

 

 

 

2,103,342

 

 

 

2.43

 

 

 

5.50

 

 

Summary of Warrant Activity

Warrant activity is summarized as follows:

 

 

Shares

 

 

Weighted Average

Exercise Price

 

Warrants outstanding, December 31, 2014

 

 

650,000

 

 

$

1.24

 

Granted

 

 

 

 

 

 

Exercised

 

 

 

 

 

 

Expired

 

 

 

 

 

 

Cancelled

 

 

 

 

 

 

Warrants outstanding, December 31, 2015

 

 

650,000

 

 

 

1.48

 

Granted

 

 

 

 

 

 

Exercised

 

 

(200,000

)

 

 

 

Expired

 

 

 

 

 

 

Cancelled

 

 

 

 

 

 

Warrants outstanding, December 31, 2016

 

 

450,000

 

 

 

1.50

 

Granted

 

 

 

 

 

 

Exercised

 

 

(450,000

)

 

 

1.50

 

Expired

 

 

 

 

 

 

Cancelled

 

 

 

 

 

 

Warrants outstanding, December 31, 2017

 

 

-

 

 

$

-

 

Warrants exercisable at December 31, 2017

 

 

-

 

 

$

-