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Stockholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2018
Stockholders' Equity Note [Abstract]  
Share-based Compensation, Stock Options, Activity
Stock option activity for options granted under the 2017 Plan during the nine months ended September 30, 2018 is presented in the table below:
 
Number of Shares Available
 
Number of Options Outstanding
 
Weighted-average Exercise Price
 
Weighted-average Remaining Contractual Term (years)
 
Aggregate Intrinsic Value (in Thousands)
Outstanding at July 31, 2017
—

 
—

 
—

 
 
 
 
Total shares authorized
400,000

 
—

 
—

 
 
 
 
Granted
(214,000
)
 
214,000

 
$
37.62

 
9.71
 
 
Exercised
—

 
—

 
—

 
 
 
 
Forfeited
40,000

 
(40,000
)
 
$
49.93

 
 
 
 
Balance at December 31, 2017
226,000

 
174,000

 
$
34.78

 
9.71
 
 
Annual additional options authorized
101,431

 
—

 
—

 
 
 
 
Granted
(188,550
)
 
188,550

 
$
23.49

 
 
 
 
Exercised
—

 
—

 
—

 
 
 
 
Forfeited
27,000

 
(27,000
)
 
$
24.84

 
 
 
 
Balance at September 30, 2018
165,881

 
335,550

 
$
29.24

 
9.18
 
$
50



Warrant activity for the nine months ended September 30, 2018 is presented in the table below:
 
Number of Shares
 
Weighted- average Exercise Price
 
Weighted- average Remaining Contractual Term (years)
 
Aggregate Intrinsic Value (in Thousands)
Outstanding at December 31, 2017
357,010

 
$
9.78

 
5.57
 
$
4,708

Exercised
(3,400
)
 
$
10.00

 
 
 
 

Outstanding at September 30, 2018
353,610

 
$
9.78

 
4.85
 
$
2,857

Exercisable at September 30, 2018
353,610

 
$
9.78

 
4.85
 
$
2,857

Stock option activity for the Pre-2017 Non-Qualified Stock Options for the nine months ended September 30, 2018 is presented in the table below:
 
Number of Shares
 
Weighted- average Exercise Price
 
Weighted- average Remaining Contractual Term (years)
 
Aggregate Intrinsic Value (in Thousands)
Outstanding at December 31, 2017
2,980,500

 
$
7.33

 
7.06
 
$
46,606

Exercised
(15,000
)
 
10.00

 
 
 
 

Forfeited
—

 
—

 
 
 
 
Outstanding at September 30, 2018
2,965,500

 
$
7.32

 
6.33
 
$
31,258

Exercisable at September 30, 2018
2,803,399

 
$
7.20

 
6.19
 
$
29,889
Schedule of Nonvested Share Activity
A summary of the status of the Company’s non-vested Pre-2017 Non-Qualified Stock Options as of September 30, 2018 and changes during the nine months ended September 30, 2018 is presented below:
 
Number of Options
 
Weighted Average Grant Date Fair Value
Non-vested at December 31, 2017
288,902

 
$
7.87

Vested
(126,801
)
 
$
7.93

Non-vested at September 30, 2018
162,101

 
$
7.82

A summary of the status of the Company’s non-vested options granted under the 2017 Plan as of September 30, 2018 and changes during the nine months ended September 30, 2018 are presented in the following table:
 
Number of Shares
 
Weighted Average Grant Date Fair Value Per Share
Non-vested at December 31, 2017
174,000

 
$
34.78

Granted
188,550

 
$
23.19

Forfeited
(27,000
)
 
$
24.84

Balance at September 30, 2018
335,550

 
$
29.07

Vested
(42,500
)
 
35.01

Non-vested at September 30, 2018
293,050

 
$
28.21
Schedule of Assumptions Used in the Valuation
The assumptions used in the valuation of options granted under the 2017 Plan during the nine months ended September 30, 2018 are as follows:
 
For the Nine Months Ended September 30, 2018
Market value of stock on measurement date
$14.31 to $24.84

Risk-free interest rate
2.47% to 2.89%

Dividend yield
—

Volatility factor
121% to 324%

Term
5.5 - 10 Years