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Stockholder's Equity and Stock-Based Compensation Expense (Tables)
 9 Months Ended
Sep. 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 nine months ended September 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

 
152,155

 
—

Stock options and SARs exercised/restricted stock and unit awards vested
(82,900
)
 
(202,697
)
 
(150,000
)
Cancelled/forfeited
(12,231
)
 
(66,666
)
 
(368,528
)
Outstanding at September 30, 2019
700,759

 
926,917

 
963,013
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 nine months ended September 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

 
152,155

 
—

Stock options and SARs exercised/restricted stock and unit awards vested
(82,900
)
 
(202,697
)
 
(150,000
)
Cancelled/forfeited
(12,231
)
 
(66,666
)
 
(368,528
)
Outstanding at September 30, 2019
700,759

 
926,917

 
963,013
Schedule of Valuation Assumptions
The following assumptions were used:
 
September 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
%