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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Restricted Stock Unit Activity
A summary of the Company's restricted stock unit activity during the years ended December 31, 2017, 2016 and 2015 is as follows:
 
Unvested Restricted Stock Units
 
Weighted Average Grant Date Price Per Share (a)
Outstanding as of January 1, 2015
—
 
—

Shares granted
1,689,625
 
$4.00
Shares vested
(628,695)
 
$4.00
Shares forfeited
(109,375)
 
$4.00
Outstanding as of December 31, 2015
951,555
 
$4.00
 
 
 
 
Shares granted
2,410,341
 
$3.14
Shares vested
(1,096,480)
 
$3.48
Shares forfeited
(618,893)
 
$3.47
Outstanding as of December 31, 2016
1,646,523
 
$3.29
 
 
 
 
Shares granted
2,019,078
 
$3.29
Shares vested
(1,750,773)
 
$3.38
Shares forfeited
(379,323)
 
$3.25
Outstanding as of December 31, 2017
1,535,505
 
$3.19
(a)
On an annual basis, the Company engaged an independent third-party valuation advisory consulting firm to estimate the per share value of the Company's common stock on a fully diluted basis.