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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock Option Valuation Assumptions
The fair value of each option award is estimated on the date of grant using the Black-Scholes option-pricing formula that uses assumptions noted in the following table. Expected volatilities and risk-free interest rates are based upon the expected life of the grant.
 
Assumptions
 
2017

 
2016

 
2015

Expected dividends
 
0
%
 
0
%
 
0
%
Risk free rate
 
1.56
%
 
1.14
%
 
1.11
%
Expected volatility
 
58.0% - 69.7%

 
68.0% - 71.3%

 
52.7% - 68.3%

Expected term (in years)
 
3.2 – 3.3 years

 
3.1 – 3.3 years

 
3.2 – 3.3 years
Schedule of Stock Option Transactions
Stock option transactions in each of the past three years under the aforementioned plans in total were: 
 
 
Shares
 
Exercise
Price Per Share
 
Weighted
Average
Exercise
Price
January 1, 2015 shares issuable under options
 
2,436,834

 
0.76 - 10.55

 
$
1.79

Granted
 
1,357,000

 
5.55 - 10.67

 
9.20

Exercised
 
(75,766
)
 
0.76 - 3.62

 
1.10

Expired
 
—

 
—

 
—

Forfeited
 
(125,334
)
 
1.40 – 10.67

 
8.99

December 31, 2015 shares issuable under options
 
3,592,734

 
0.79 - 10.67

 
4.36

Granted
 
739,135

 
4.72 - 8.81

 
7.26

Exercised
 
(61,834
)
 
1.10 - 6.51

 
1.54

Expired
 
—

 
—

 
—

Forfeited
 
(164,666
)
 
4.55 - 10.67

 
8.37

December 31, 2016 shares issuable under options
 
4,105,369

 
0.79 - 10.67

 
4.76

Granted
 
577,845

 
3.38 - 9.28

 
7.15

Exercised
 
(171,566
)
 
0.79 - 5.85

 
1.92

Expired
 
—

 
—

 
—

Forfeited
 
(211,838
)
 
4.80 - 10.67

 
7.70

December 31, 2017 shares issuable under options
 
4,299,810

 
$0.79 - $10.67

 
$
4.76
Schedule of Outstanding and Exercisable Stock Options
The following table summarizes information concerning outstanding and exercisable options as of December 31, 2017:
 
 
Options Outstanding
 
Options Exercisable
Range of
Exercise Price
 
Number of
Options
 
Weighted
Average
Remaining
Life (Years )
 
Weighted
Average
Exercise
Price
 
Number of
Options
 
Weighted
Average
Exercise
Price
$0.79 - $1.00
 
25,000

 
2.01
 
$
0.79

 
25,000

 
$
0.79

1.01 - 1.50
 
1,721,000

 
4.14
 
1.06

 
1,721,000

 
1.06

1.51 - 10.67
 
2,553,810

 
7.76
 
7.85

 
1,369,466

 
7.92

 
 
 
 
 
 
 
 
 
 
 
$0.79 - $10.67
 
4,299,810

 
6.28
 
$
5.09

 
3,115,466

 
$
4.07

 
The following table summarizes information concerning outstanding and exercisable options as of December 31, 2016:
 
 
 
Options Outstanding
 
Options Exercisable
Range of
Exercise Price
 
Number of
Options
 
Weighted
Average
Remaining
Life (Years )
 
Weighted
Average
Exercise
Price
 
Number of
Options
 
Weighted
Average
Exercise
Price
$0.79 - $1.00
 
50,000

 
3.01
 
$
0.79

 
50,000

 
$
0.79

1.01 - 1.50
 
1,808,400

 
5.11
 
1.07

 
1,808,400

 
1.07

1.51 - 10.67
 
2,246,969

 
8.35
 
7.82

 
805,803

 
7.15

 
 
 
 
 
 
 
 
 
 
 
$0.79 - $10.67
 
4,105,369

 
6.86
 
$
4.76

 
2,664,203

 
$
2.90


The following table summarizes information concerning outstanding and exercisable options as of December 31, 2015: 
 
 
Options Outstanding
 
Options Exercisable
Range of
Exercise Price
 
Number of
Options
 
Weighted
Average
Remaining
Life (Years )
 
Weighted
Average
Exercise
Price
 
Number of
Options
 
Weighted
Average
Exercise
Price
$0.76 - $1.00
 
50,000

 
4.01
 
$
0.79

 
50,000

 
$
0.79

1.01 - 1.50
 
1,862,400

 
6.14
 
1.07

 
1,851,400

 
1.07

1.51 - 10.55
 
1,680,334

 
8.96
 
8.10

 
289,997

 
4.02

 
 
 
 
 
 
 
 
 
 
 
$0.79 - $10.67
 
3,592,734

 
7.43
 
$
4.36

 
2,191,397

 
$
1.45
Nonvested Stock Option Activity
A summary of non-vested options at December 31, 2017 and changes during the year ended December 31, 2017 is presented below: 
 
 
Options
 
Weighted
Average
Grant Date
Fair Value
Non-vested options at January 1, 2017
 
1,441,166

 
$
3.58

Granted
 
577,845

 
3.37

Vested
 
(654,156
)
 
3.62

Forfeited
 
(180,511
)
 
3.46

Non-vested options at December 31, 2017
 
1,184,344

 
$
3.48
Schedule of Nonvested Shares of Restricted Stock
A summary of non-vested shares of restricted stock and changes during each of the past three years is as follows:
 
 
Number of
Restricted Stock
 
Weighted Average
Issuance Price
Non-vested balance at January 1, 2015
 
108,334

 
$
2.86

 
 
 
 
 
Changes during the period:
 
 

 
 

Shares granted
 
32,500

 
10.67

Shares vested
 
(140,834
)
 
4.66

Shares forfeited
 
—

 
 

Non-vested balance at January 1, 2016
 
—

 
$
—

 
There have been no restricted stock issuances in the year ended 2016 or 2017.

A summary of non-vested RSUs and changes during each of the past three years is as follows:
 
 
Number of
RSUs
 
Weighted Average
Issuance Price
Non-vested balance at January 1, 2016
 
182,750

 
$
10.23

 
 
 
 
 
Changes during the period:
 
 

 
 

Shares granted
 
58,068

 
7.50

Shares vested
 
(60,918
)
 
10.13

Shares forfeited
 
—

 
—

Non-vested balance at December 31, 2016
 
179,900

 
$
9.35

 
 
 
 
 
Changes during the period:
 
 
 
 
Shares granted
 
93,468

 
7.26

Shares vested
 
(80,274
)
 
9.57

Shares forfeited
 
(4,465
)
 
7.09

Non-vested balance at December 31, 2017
 
188,629

 
$
9.35