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Stockholder's Equity and Stock-Based Compensation Expense (Tables)
 9 Months Ended
Sep. 30, 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 nine months ended September 30, 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
10,000

 
66,773

 
—

Stock options and stock appreciation rights exercised/restricted stock and unit awards vested
(70,086
)
 
(137,844
)
 
(34,999
)
Cancelled/forfeited
(25,319
)
 
(2,500
)
 
—

Outstanding at September 30, 2018
804,936

 
128,131

 
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 nine months ended September 30, 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
10,000

 
66,773

 
—

Stock options and stock appreciation rights exercised/restricted stock and unit awards vested
(70,086
)
 
(137,844
)
 
(34,999
)
Cancelled/forfeited
(25,319
)
 
(2,500
)
 
—

Outstanding at September 30, 2018
804,936

 
128,131

 
530,865