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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 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 three months ended March 31, 2017:
 
 
Shares
 
Weighted-Average Grant Date Fair Value
Unvested RSUs at December 31, 2016
 
781,500

 
$
12.53

Granted
 
48,000

 
$
13.38

Forfeited
 
(25,000
)
 
$
13.30

Vested
 
(285,875
)
 
$
12.24

Unvested RSUs at March 31, 2017
 
518,625

 
$
12.72

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

 
$
9.89

Granted
 
258,500

 
$
9.25

Forfeited
 
(29,099
)
 
$
10.76

Vested
 
(114,936
)
 
$
11.36

Unvested RSUs at March 31, 2018
 
1,083,710

 
$
9.56