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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
The following table summarizes the Company's restricted stock unit ("RSU") activity for the six months ended June 30, 2019:
 
Unvested
Time-Based
RSUs
 
Unvested Performance-Based RSUs
 
Weighted-Average Grant Date Price Per Share (a)
Outstanding as of January 1, 2019
1,548,150

 

 
$3.18
Shares granted
1,109,078

 
863,847

 
$3.14
Shares vested
(227,707
)
 

 
$3.14
Shares forfeited
(82,898
)
 

 
$3.19
Outstanding at June 30, 2019
2,346,623

 
863,847

 
$3.16

(a)
On an annual basis, the Company engages an independent third-party valuation advisory firm to estimate the per share value of the Company's common stock.