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Stockholder's Equity and Stock-Based Compensation Expense (Tables)
 3 Months Ended
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [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 stock appreciation rights awards for the three months ended March 31, 2018:
 
Stock Options
 
Restricted Stock and Unit Awards
 
Stock Appreciation Rights
 
Number of Shares
Outstanding at December 31, 2017
890,341

 
201,702

 
565,864

Granted
—

 
61,365

 
—

Stock options and stock appreciation rights exercised/restricted stock and unit awards vested
(11,250
)
 
(81,014
)
 
(34,999
)
Cancelled/forfeited
(7,334
)
 
—

 
—

Outstanding at March 31, 2018
871,757

 
182,053

 
530,865
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 stock appreciation rights awards for the three months ended March 31, 2018:
 
Stock Options
 
Restricted Stock and Unit Awards
 
Stock Appreciation Rights
 
Number of Shares
Outstanding at December 31, 2017
890,341

 
201,702

 
565,864

Granted
—

 
61,365

 
—

Stock options and stock appreciation rights exercised/restricted stock and unit awards vested
(11,250
)
 
(81,014
)
 
(34,999
)
Cancelled/forfeited
(7,334
)
 
—

 
—

Outstanding at March 31, 2018
871,757

 
182,053

 
530,865