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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2017:
 
 
Shares
 
Weighted-Average Grant Date Fair Value
Unvested RSUs at December 31, 2016
 
781,500

 
$
12.53

Granted
 
214,500

 
$
12.22

Forfeited
 
(36,000
)
 
$
13.30

Vested
 
(467,629
)
 
$
12.44

Unvested RSUs at June 30, 2017
 
492,371

 
$
12.42

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

 
$
9.89

Granted
 
344,000

 
$
9.35

Forfeited
 
(44,165
)
 
$
10.87

Vested
 
(454,011
)
 
$
9.93

Unvested RSUs at June 30, 2018
 
815,069

 
$
9.59