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

 
$
13.75

Granted
 
669,550

 
$
9.30

Forfeited
 
(86,425
)
 
$
10.59

Unvested PSUs at December 31, 2019
 
835,625

 
$
10.51

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

 
$
8.83

Granted
1,079,150

 
$
6.04

Forfeited
(45,643
)
 
$
7.16

Vested
(736,706
)
 
$
8.06

Unvested RSUs at December 31, 2019
1,107,796

 
$
6.69