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Stockholder's Equity and Stock-Based Compensation Expense (Tables)
 6 Months Ended
Jun. 30, 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 six months ended June 30, 2020:
Stock OptionsRestricted Stock and Unit AwardsStock Appreciation Rights
Number of Shares
Outstanding at December 31, 2019689,209  908,754  954,679  
Granted—  67,500  —  
Stock options and SARs exercised/restricted stock and unit awards vested(5,000) (17,089) —  
Cancelled/forfeited(36,726) (85,794) (47,829) 
Outstanding at June 30, 2020647,483  873,371  906,850  
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, 2020:
Stock OptionsRestricted Stock and Unit AwardsStock Appreciation Rights
Number of Shares
Outstanding at December 31, 2019689,209  908,754  954,679  
Granted—  67,500  —  
Stock options and SARs exercised/restricted stock and unit awards vested(5,000) (17,089) —  
Cancelled/forfeited(36,726) (85,794) (47,829) 
Outstanding at June 30, 2020647,483  873,371  906,850  
Schedule of valuation assumptions The following assumptions were used:
Risk-free interest rates1.9 %
Expected lives (in years)5.31
Expected dividend yield— %
Expected volatility79 %