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Stockholder's Equity and Stock-Based Compensation Expense (Tables)
 3 Months Ended
Mar. 31, 2020
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 three months ended March 31, 2020:
 
Stock Options
 
Restricted Stock and Unit Awards
 
Stock Appreciation Rights
 
Number of Shares
Outstanding at December 31, 2019
689,209

 
908,754

 
954,679

Granted
—

 
67,500

 
—

Stock options and SARs exercised/restricted stock and unit awards vested
—

 
(16,089
)
 
—

Cancelled/forfeited
(20,000
)
 
(56,961
)
 
(17,082
)
Outstanding at March 31, 2020
669,209

 
903,204

 
937,597
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 three months ended March 31, 2020:
 
Stock Options
 
Restricted Stock and Unit Awards
 
Stock Appreciation Rights
 
Number of Shares
Outstanding at December 31, 2019
689,209

 
908,754

 
954,679

Granted
—

 
67,500

 
—

Stock options and SARs exercised/restricted stock and unit awards vested
—

 
(16,089
)
 
—

Cancelled/forfeited
(20,000
)
 
(56,961
)
 
(17,082
)
Outstanding at March 31, 2020
669,209

 
903,204

 
937,597
Schedule of valuation assumptions
The following assumptions were used:
Risk-free interest rates
1.9
%
Expected lives (in years)
5.31

Expected dividend yield
—
%
Expected volatility
79
%