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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2019
Share-based Payment Arrangement [Abstract]  
Summary of Unvested RSU and PSU Award Activity
The table below summarizes performance unit (“PSU”) activity for the six months ended June 30, 2019:
 
 
Shares
 
Weighted-Average Grant Date Fair Value
Unvested PSUs at December 31, 2018
 
252,500

 
$
13.75

Granted
 
669,550

 
$
9.30

Unvested PSUs at June 30, 2019
 
922,050

 
$
10.52

 
 
 
 
 
The table below summarizes RSU award activity for the six months ended June 30, 2019:
 
 
Shares
 
Weighted-Average Grant Date Fair Value
Unvested RSUs at December 31, 2018
 
810,995

 
$
8.83

Granted
 
762,350

 
$
6.39

Forfeited
 
(20,251
)
 
$
7.52

Vested
 
(402,056
)
 
$
8.28

Unvested RSUs at June 30, 2019
 
1,151,038

 
$
7.43