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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Unvested RSU Award Activity
The table below summarizes unvested RSU activity for the year ended December 31, 2018:
 
Shares
 
Weighted-Average Grant Date Fair Value
Unvested RSUs at December 31, 2017
969,245

 
$
9.89

Granted
567,500

 
$
8.41

Forfeited
(44,165
)
 
$
10.87

Vested
(681,585
)
 
$
9.86

Unvested RSUs at December 31, 2018
810,995

 
$
8.83