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Stockholder's Equity and Stock-Based Compensation Expense (Tables)
 6 Months Ended
Jun. 30, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of Stock Options Activity
The following table presents a summary of the activity related to stock options, restricted stock, restricted stock unit awards and SARs awards for the six months ended June 30, 2019:
 
Stock Options
 
Restricted Stock and Unit Awards
 
Stock Appreciation Rights
 
Number of Shares
Outstanding at December 31, 2018
785,890

 
1,044,125

 
1,481,541

Granted
10,000

 
17,500

 
—

Stock options and SARs exercised/restricted stock and unit awards vested
(24,500
)
 
(201,631
)
 
(50,000
)
Cancelled/forfeited
(4,731
)
 
(65,000
)
 
(368,528
)
Outstanding at June 30, 2019
766,659

 
794,994

 
1,063,013
Schedule of Restricted Stock and Units Awards Activity
The following table presents a summary of the activity related to stock options, restricted stock, restricted stock unit awards and SARs awards for the six months ended June 30, 2019:
 
Stock Options
 
Restricted Stock and Unit Awards
 
Stock Appreciation Rights
 
Number of Shares
Outstanding at December 31, 2018
785,890

 
1,044,125

 
1,481,541

Granted
10,000

 
17,500

 
—

Stock options and SARs exercised/restricted stock and unit awards vested
(24,500
)
 
(201,631
)
 
(50,000
)
Cancelled/forfeited
(4,731
)
 
(65,000
)
 
(368,528
)
Outstanding at June 30, 2019
766,659

 
794,994

 
1,063,013
Schedule of Valuation Assumptions
The following assumptions were used:
 
June 30, 2019
 
December 31, 2018
Risk-free interest rates
1.97
%
 
3.0
%
Expected lives (in years)
5.31

 
5.31

Expected dividend yield
—
%
 
—
%
Expected volatility
86.1
%
 
82.9
%