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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Unvested RSU Award Activity
The table below summarizes unvested RSU award activity for the nine months ended September 30, 2017:
 
 
Shares
 
Weighted-Average Grant Date Fair Value
Unvested RSUs at December 31, 2016
 
781,500

 
$
12.53

Granted
 
254,500

 
$
11.67

Forfeited
 
(36,000
)
 
$
13.30

Vested
 
(594,380
)
 
$
12.45

Unvested RSUs at September 30, 2017
 
405,620

 
$
12.03

The table below summarizes unvested RSU award activity for the nine months ended September 30, 2018:
 
 
Shares
 
Weighted-Average Grant Date Fair Value
Unvested RSUs at December 31, 2017
 
969,245

 
$
9.89

Granted
 
359,500

 
$
9.33

Forfeited
 
(44,165
)
 
$
10.87

Vested
 
(569,585
)
 
$
9.89

Unvested RSUs at September 30, 2018
 
714,995

 
$
9.55